It had all started long ago, when a legend had entered our world.

Several years ago

A woman was walking down to her home, she looks to be around 19, very well near 20 years of age. Had long green hair, a well developed body and looked very beautiful, she had recently been on a date and little to say it didn't go so well.

"That's the seventh date this month... I don't know what went wrong. I made sure I dressed nice, I was polite, I didn't rush anything. Yet he said it wasn't going to work" she sighed, then had looked ahead to her apartment. once reaching her unit the woman decided to head to bed. "Maybe... maybe I'm not meant to love anyone..." before she could let the thought sink in she noticed a flicker of light in the hallway, the woman then saw an electric spark in the air. Which had sparked more before turning into a portal, surprising her, she then noticed a silhouette in it and saw it was starting to grow larger and larger.

She backed away out of fear, not knowing if this was a villain or a friend, then out of no where a person had been flung out. A young man, the same age as her actually, he had short brown hair, a well muscled physique and oddly a bizarre looking watch on his left arm. "Oww that hurts, last time I help test an invention with Blukic and Driba" he grunted. Then winced as he held his arm, which looked mildly burned "oh my are you okay?" The female asked concerned, he looked back to her and blushed "oh uh... yeah, just a small burn, I've been through worse" he said standing up.

"I'll be fine" he was about to head back into the portal before the woman stopped him while carrying a first aid kit. "Wait, you shouldn't let that go on, at least let me help you" she said, she genuinely did want to help this person out. Even if she didn't know him at all, she felt compelled to do so, and knew he had a good heart. "W-well..." he muttered, blushing a bit still as he pulled on his collar with his uninjured hand "I guess it's okay" the young man then sat next to her as she applied a lotion to his arm and began bandaging it.

"Thanks by the way, my name's Ben, Ben Tennyson" Ben introduced smiling at her, looking up she saw his smile. It was nice and she could sense the kindness in him, she also noticed he attractive he was too, blushing herself she smiled back and replied "y-you're welcome, my name's Inko Midoriya" she introduced.

An awkward silence kept as she treated his burn, then Ben decided to break the ice "so... you single?" He asked, mentally berating himself over what he had just done. 'Nice job Tennyson! Now you sound like a creep! Next you'll go asking if she wants to get to second base!' He thought. The question made Inko blush, but she gulped and responded back "w-well, yea I am single... you willing to mingle?" She joked and winked. Then berated herself as well 'what the actual heck Inko?! Has Mitsuki been rubbing off on me?! Why the hell did I ask that?! Am I that desperate for love?! Great he probably thinks I'm weird now!' She thought.

"Uh... well... if you... I uh... mmm..." the two of them kept on stuttering. Then had decided to stay silent in order to avoid anymore embarrassment, this had only gone on for a few seconds though before the two had accidentally kissed each other. Then had down it again on purpose, before going deeper.

Eventually Ben did end up asking if she wanted to hang out some time, these hang outs eventually turned into dates.

A few years later

The legend and his beloved had then grew closer.

Inko was seen pacing around her apartment, she and Ben have been dating for quite a while now. She still couldn't believe it, her new boyfriend, Ben Tennyson, was a hero from another universe, the thought alone was extraordinary. Not to mention Ben was such a sweetheart to her, sure he did have his moments where he was a bit of a goof and a showboat every so often.

Even still, he always treated Inko with respect and loved her to no end, heck they've even (ahem) gone all the way to third, which certainly surprised her childhood friend Mitsuki. Since between the two of them Inko had been the one who preferred to take things slow, yet she was the one who jumped Ben first. Mitsuki hadn't even done it with her beloved Masaru yet and they're married already.

Though, recently things have been different, lately Ben's visits have been less common than when they first started dating. At first she paid it no kind, assuming that with his job of being his world's protector he'd be busy quite a lot, but during the times he came to visit her recently he seems a lot more tired and a lot more irritable. She was worried that he was upset, hoping it wasn't because of her, "oh dear... I hope I didn't do anything to upset him" she muttered sweating a bit due to stress.

Suddenly the portal opened up in her living room, as it always does when Ben visits, she was hoping that he was in a good mood, that way she could ask him what was wrong. And much to her relief Ben came in, with a very big smile on his face, "hey Inko!" He greeted giving her a hug, she sighed in relief knowing he was feeling better and hugged back.

"Ben, good to see you again" she said as they kissed a bit, though he did notice the stress in her expression. "Sweetie are you okay?" Ben asked concerned, "oh yes, why?" Inko asked feeling about nervous. "You've got that nervous look in your eyes like when you first me my parents" He explained. She looked down, "well... I don't mean anything bad, but you seemed to be rather upset lately... I was worried I had done something that upset you but I didn't want to assume that you were!" She explained bracing herself in case he snapped. But heard nothing, and saw her boyfriend with a guilty expression on his face "r-really? Oh Inko, I'm sorry. I'm really sorry, I promise I'm not upset with you" he said giving her a hug. "You aren't?" She asked, "I'm not, I could never, sorry I've been like that lately, the reason I haven't been visiting as often as I normally do and why I've been on edge. You see I've taken on a few more jobs lately and it took a lot of my time" Ben explained.

She smiled, feeling relieved that she hadn't upset him "that's good to know, wait why did you take on those jobs?" Inko asked curiously, "that's a surprise. Anyway, I wanted to ask you if you were up for coming to an outing with my family tomorrow" Ben asked.

Inko smiled and nodded "of course Ben! I'd love to... your grandfather won't be cooking again will he?" She asked feeling a little sick, Ben's grandpa Max, while a nice and kind man, had made the worst kinds of cooking known to mankind. The first try of his stew made her stomach turn, since it had been made from dung beetles "not too worry we made sure he won't be on kitchen duty" Ben assured making her feel relief again.

"That's good, oh is it alright if Mitsuki and Masaru come? She's been assuming some things since you haven't been around lately and I'd like to get that straightened out now" Inko asked. "Yeah, actually I was about to ask if you could invite them, as well as some of your family" Ben replied smiling.

Later

In Ben's world, his family and friends alongside Inko, ages members of her family, Mitsuki and Masaru, were now eating at a large field for an outdoor barbecue. "Good to know he hasn't been cheating on you" Mitsuki said as she ate some ribs, "I told you Ben isn't that kind of person Mitsuki" Inko reprimanded eating a veggie burger. "Gotta admit, this place is pretty cool. Especially with all the aliens" Masaru commented as a tall red four armed and four eyed alien woman walked by with a telekinetic squid like alien hovering next to her.

Ben then appeared behind his girlfriend and hugged her, causing the green haired woman to jump from the surprise "hey Inko! Glad you could make it" he said giving her a kiss to the cheek. "Hey Ben, good to see you're still faithful" Mitsuki teases, "oh hat har, so I accidentally caught the eyes of a few girls back in the day. Inko's the only woman for me" he replied jokingly but also quite serious. "Nice to see you again bud" Masaru greeted as they shook hands.

The barbecue when great, then towards the end Ben asked Inko to come with him, which had been to a lake. She had been here before, one of their first dates Ben explained this was his grandpa's secret fishing spot and had shown her a tree with his grandparents' names carved into it. On their date Ben decided to cave their names in it also, right beneath his Grandpa and Grandma's. "So what are we doing here Ben?" She asked, turning to him, then was confused as he wasn't in sight "Inko" hearing his voice just bellow her she looked down.

Then was surprised he had kneeled by her feet and had taken her hand, "while I know we come from different worlds, you've been the brightest light in my life, and I want to keep that light with me always. So would you make me the happiest man in the multiverse?" he then took out a small box, and opened it to reveal a ring with a bright glowing crystal on it. Shocking her even more, "and please marry me?"

Unable to hold her joy in any longer Inko had jumped in place "Yes yes yes yes A thousand times yes!" She then jumped into his arms and kissed him deeply. With several yells and whistles coming from behind them, revealing their friends and family "WOOH! Good on yah Inko!" Mitsuki shouted overjoyed for her friend. "Can you also help the happiest man in the multiverse and help me pulverize these eves-droppers?" He asked getting his Omnitrix ready. She then stood up and readied her quirk, which she had trained to become stronger over time "gladly" Inko replied, both with evil grins. "RUN!" The group then ran as the newly engaged couple gave case.

A few years after

The legacy is then born to carry on the torch

Ben had arrived in he and Inko's shared apartment after a long day of work back in his world, at this moment all he wanted to do was kick back and cuddle with his wife. That was his intention before hearing a familiar sniffling, reacting immediately Ben bolted to the living room and saw a crying Inko sitting on the couch.

"Honey what's wrong?!" He said running up to her, "what happened, did someone hurt you?! Tell me who they are and I'll crush their skull!" He said, then was surprised to see her looking at him. With a smile, "b-Ben..." she sniffled, then hugged him "you won't believe it" "what? What's the problem?" He asked confused "nothing, there isn't a problem. It's the opposite"

Inko then held up with looked like... a pregnancy test, the result shocked her husband "a-wah..." she then placed his hand on her somewhat more full belly. "Say hello to daddy"

Ben had then flinched as he belt something hit his hand, "I-Inko... you're..." he asked tearing, she nodded. He then pulled her close and hugged her, overjoyed with emotion... they were about to have a baby!

5 months later

Inko was lying in a hospital bed breathing heavily, with Ben right beside her, clutching his hand. His wife had entered labor that morning and they spent the entire day at the local hospital. With Mrs. Tennyson in pain from having to push a baby out, and Mr. Tennyson in pain due to his wife almost crushing his hand during the birthing process. But it was all worth it in the end, "Mrs. Tennyson" the doctor called out as a he walked in with a nurse bringing in a small baby wrapped in a blue blanket, "would you like to see your baby?" The nurse asked. Both parents nodded, the baby was then given to them, they were amazed, the baby was a healthy young boy, with Ben's emerald green eyes and Inko's dark green hair.

"He's perfect" she said stroking her son's head, "he's worth more than all the universes around" Ben added tickling the boy. Which earned a giggle out of him, "you should feel lucky you two, your baby seems to be the healthiest one we've ever had" the doctor notes. "What will you be naming the little cutie?" The nurse asked as Ben and Inko's families started to pile in "Izuku, Izuku Midoriya Tennyson" They both said.

"I-Iuyuku" he chirped, earning a collective "Awww" from the family.

A few years after

As the legacy grew, a complication occurred

As Izuku grew, both his parents had tried within all their power to give their son a happy life he deserved. The boy was smart, strong and so very nice and generous to others, they often took him on outings in both their worlds and they periodically lived in either so Izuku could feel at home in either universe.

Though when it came time for Izuku to get his quirk registered... "I'm sorry, but your son is quirkless" their doctor had said, shocking the boy "if any case, you should give up on being a hero, without a quirk you have no chance"

In that moment Izuku's world had been shattered, or almost had it not been for his father who became furious beyond all comprehension. "YOU TAKE THAT BACK YOU JACKA**!" Ben roared grabbing the man by the lab coat. "Honey calm down!" Inko admonished her husband "not until this jerk face takes back what he said!" Ben said just about ready to throw the quack out the window. Thankfully for the man Inko managed to stop him from doing something that could get him arrested.

He did apologize for his episode of rage at the hospital, Ben also assured Izuku that he wasn't mad at him, and that with or without a quirk he'll always be their little hero. The next year had been rough with a couple of kids teasing Izu about being quirkless, even his so called friend Katsuki who had been Mitsuki's son.

Despite that though Izu still enjoyed life as his parents had always loved and supported him and he still had pro heroes he could look up to. Like his favorite just behind his dad All Might. Though the bullying had escalated after an incident at a playground with Izuku standing up to Katsuki for bullying a kid with a weak quirk, and as the adult watching over them Ben saw, which resulted in him being just as angry as he was during the incident at the doctor's office. He then discovered that the kids at Izuku's school had been treating his son the same way, which warranted a trip to the principal's office to get them to fix it. As well as Mitsuki and Masaru to get them to fix their son.

Unfortunately that hadn't done any good, well Mitsuki and Masaru have both been trying to get their son to behave but for some reason he wasn't letting up on his behavior. In fact he's been being even more mean to Izuku, the school also hasn't done a thing about the bullying, nearly prompting Ben to go full Atomix and threatening to drop a third atomic bomb on the school for the treatment his son had to suffer.

Heck Inko didn't even try to hold him back this time, she was just as angry, even telling her husband to do it. Though oddly, in spite of the awful treatment Izuku had begged his parents not to, he may have not enjoyed being bullied as he was, but he didn't want his mom and dad to get in trouble. This did save he school and those rotten kids from getting completely annihilated, but Ben had definitely pulled Izuku out of that school.

The family then decided to move to Ben's world so they won't have to deal with this anymore, however Izuku had pleaded with them not to. "Why Izuku? You know how they treated you, what's the point of staying here if they're going to act so horrible?" Ben asked as he and Inko packed up the last of their stuff. "I know dad, but still, we're abandoning this world. Didn't you always tell me that you never turn your back on the innocent?" Izuku asked. "That my be so son, but none of those kids or people are innocent, and I'm not letting my son get picked on by a bunch of snot nosed brats" he asserted, "then what about aunty Mitsuki and uncle Masaru?" Izuku asked making his parents freeze, "we still love them don't we? And we wouldn't abandon them?" The two couldn't lie, while Ben hated Katsuki because he always picked on Izu. He and Inko still liked the other Bakugou's company and had loved them as if they were family.

"This world isn't perfect, that's true. But that's why we need to stay dad" he said crying a bit, "you're a hero, heroes are meant to do more than protect the innocent. Heroes also help make a better world. I wanna be a hero like you and All Might dad" he said hugging Ben. "I want to be a hero here, to help make this world a better place, to be a symbol of hope for everyone".

Neither parent could argue with their son, Izuku was right, heroes are meant to help make the world a better place. Turning their backs on this world would go against everything a hero stands for. But they didn't want Izuku to stay here, at least not forever, maybe until he was strong enough to handle himself. So they made a deal, Izuku and Inko will stay in Ben's world for the next few years, in that time his dad will train him in order to become stronger and better, once he's old enough and strong enough, and if Izuku is ready for it, they will return back to Inko's world and Izuku can attend the famous high school UA and train to be a hero like he always wanted.

He agreed, excited to become a hero like his dad.

A few years after

"Come on dad, come at me!" Izuku called out, now about 13 with a well developed body like his dad, along with a handsome face and still retaining his kind heroic personality. Ben, as HeatBlast, then throws his son two fire balls, the boy had run to them, then dodged one ball before sprinting straight for another.

Rather than attempting to dodge Izuku smirks, during his time in his dad's world, the green haired kid had indeed had a happier life. With most humans being quirkless he wasn't so out of place, yet just like his old world it wasn't just all humans, there were also aliens around him who were just as bizarre as Quirk users. Only less discriminant of others knowing how it feels to be alienated.

He also discovered another thing, which is now displayed as he ran right into the fire ball, turns out Izuku was never quirkless. As the fire diminished Izu's hair was now a wild flame and his face resembled burning magma, turns out he had a secret quirk all along. It just hadn't activated until last year, when Ben had been in a pickle with Vilgax Izuku stepped in to help his father. While trying to defend him from another blow the boy's hand had turned into Heat Blast's and shot a strong fire ball at the squid like alien's face. Blinding him just long enough for Ben to get the upper hand on old squid face.

Azmuth then scanned him, revealing Izuku had an undetectable quirk that lied dormant within him, it hasn't activated due to two reasons. One is that his quirk allowed him to express the genetics of whatever DNA source he had made contact with, which was his dad. So he needed to be in constant contact with one to use it, the other is that it only unlocked due to him rushing in to protect Ben. His overwhelming need and desire to protect those he cares about was the main catalyst in activating his powers.

With this new discovery both Azmuth and Ben had given his son a special Omnitrix data core, which they had grafted onto his body. That way Izuku could have a constant source of DNA to use, and Ben had increased his son's training regimen. Not that Izuku minded, he was glad his dad was pushing him to train harder, he understood it was to help him grow with his new powers and become stronger. Ben was also happy that his son understood, and was willing to give it his everything, in order to live up to him as a hero of heroes. Speaking of.

"Nice job Izuku, you're getting faster with your reflex transformations" Ben commented as he turns back, with Izu reverting his head back to normal "thanks dad, I do admit though that on the last fire ball I couldn't react on time. So my transformation was a bit late" the green haired teenager admits. Izu had also learned the value of humility, usually admitting his faults in order to show he knows his flaws and tries to overcome them. "Even so, great job Izuku, you always make me proud" Ben said giving his son a noogie, "hey boys, how are my big strong men doing today?" Inko asked, she had been watching their sparring session and had decided to bring them some drinks.

"Thanks mom, really appreciate it" Izuku said drinking some water as his dad had sprayed it on his body before drinking from the bottle. "Don't overdo it now, it's always important to take a break every once in a while" she added, "I understand sweetie" Ben said giving her a kiss. Wanting to avoid his parents' displays of affection Izuku had walked away, in hopes of finding either his cousins Devlin and Natalie, or his little sister Izumi, Inko stared at her son before looking at her husband "you know. He's getting to the age" she said as he frowned a bit, "I know. That's what worries me" Ben replied, knowing that soon they're going to go back.

"I know, I'm worried to, but we have to remember, things are different now. Izu's not the same person he was before, sure he's still a bit nervous and shy. But he's also grown to be brave, selfless, and he still has his heroic mindset and his kind heart. All of those he got from you" she said before making him look at her. "Izuku's not a little boy anymore, and he's more than a young man. At this point, Izuku really is the hero he's dreamed of being, he's like you Ben" she said cheering him up. "I guess, but that's also what I'm aftaid of" he said confusing Inko. "I was very irresponsible and cocky when I had my powers, I don't want that for Izuku" Ben explained.

She sighed, slightly agreeing with him, with how Ben was when they first met, and as they began dating she was told by Gwen and Kevin about his antics. However, seeing her husband now, she was couldn't care less, Ben had definitely learned from his mistakes in the past. Now he was striving to become a better hero no just for himself, but also for Izuku.

"I know, but that's why I'm also not worried" inko said catching his attention, "he's your son. And Even though you had lots of bumps on your journey, you've learned from them to become the fine man you are now. And if you can become the 'Hero of Heroes' so can Izuku" Inko explained. Earning a smile from Ben before they hugged, "thanks honey, I just hope he's ready to handle that world, from what Mitsuki told us the last time we called her" he commented. "I'd feel more worried about the world since he's our son" she joked as they both snickered.

Present

We see Izuku, Ben, Inko and their younger daughter Izumi, inside a large plumber ship in front of a large circular machine in the Plumber Headquarters. With the now 15 year old Izuku standing tall and proud, "well, this is it" he said as Blukic and Driba turned on the machine.

Which had created a large portal, "that it is son" Ben said placing a hand on his son's shoulder, "that it is Izu" Inko adds, currently piloting the craft. Turns out she was a skilled pilot and now worked as both a medic for the Plumbers and a fighter pilot for plumber space and air support. "This is so cool" Izumi said jumping in her seat. "Hope you all have a safe trip" Max said waving to his grandson, great grandkids, and granddaughter in law, "will do Grandpa Max" Izuku said waving out the window.

The engine then revs to life with the ship beginning to hover in place, "time to show our world" Izuku then puts on a visor his dad got him for his birthday. "The next #1 hero" they then speed through the portal.

________________________

The view goes to black as Izuku stands with an aura of green radiating off him with his Omnitrix core glowing brightly in his chest. And eyes glowing bright green.

This here is the story of how I, Izuku Midoriya Tennyson, became the greatest hero from not just one, but two worlds.

Izuku then charges up various alien arms into his right fist before reeling it back.

And not only am I the legacy of my dad, but I'm also the successor of my other idol as well.

Behind Izuku is a silhouette of his father forming as well as his mom, then Izumi, and other members of his family Before All Might's form manifests next to Ben, then the other previous One for All Users.

From here on I shall not just Go Beyond, I will go further than any hero gone before.

Izuku's body then radiates with green aura before turning his arms and growing Alien X's crest.

GO INFINITELY! PLUS ULTIMATE!