I own at least one of these fandoms.
*cricket noises*
*sigh* My lawyer has told me I need to be honest. I own none of these fandoms. 

You asked so you shall recieve. I personally wanted Merlin. You asked for Percy Jackson, Harry Potter, and Marvel. I have Magnus Chase and Kane Chronicles because they are part of the Riordanverse.

No Civil War no particular time line is followed. This is linked to both Arthur Return's (Halloween Special: Merlin/HP) and Loki is a Mother (Marvel/Magnus Chase) . 

-Mystery

Peter was excited Mr. Stark had invited him to a Christmas Party at the tower. Peter was supposed to be officially introduced to the Avengers and some of friends that Thor had invited. A few other big CEOs were supposed to be there. 

When Peter and May made it to the tower F.R.I.D.A.Y. greeted the duo before letting them up. 

Peter was shocked. There were more people than he thought and the entire banquet floor was crowded.  Apparently a group had arrived earlier in the day and Tony had extended an invitation to them and they accepted. 

"Peter. My favorite prodigy," Tony exclaimed as Peter and May exited the elevator. 

"I'm your only prodigy, Mr. Stark," Peter retorted. 

"True. True," Mr. Stark dismissively replied before grabbing Peter's shoulders and leading him away from May and over to a group of people. 

"This is Mr. Dare, CEO of Dare Industries and his daughter Rachel Elizabeth Dare," Tony introduced. 

"I hope you don't mind Mr. Stark but I brought a few friends. Oh and Peter nice to see you again," Rachel replied not looking up from her drawing.

"Okay I guess," Tony told the redhead as over a hundred teens streamed out the elevator. How they fit in there was a mystery. 

"Nice to see you too RED," Peter chirped before dragging Tony off to distract him from the hundreds of teens.

"I didn't know you knew Rachel Dare. How many other billionaires do you know?" Tony asked a hint of jealousy in his voice. 

"Um... Let's see. Danny Rand, Harry Osborn and by extension his father. You and RED." 

"How do you know all these people?" 

"You: Spider-Man. Danny: Spider-Man. Rachel: Camp. Harry: Childhood." 

"I didn't know you go to a camp." 

"That's because it's for people like me with ADHD and/or Dyslexia. Most of the time we attract a lot of trouble. Not just muggers and bad teachers, but also mythological trouble." 

"What do you mean?" 

"You know that bronze that is in some of my webs?" 

"Yeah." 

"Its a bronze called Celestial Bronze only found in Mount Olympus." 

"Do you mean there are other pantheons besides Norse?" 

"Yep. There are Greeks and Romans. I believe that Egyptians also exist. I think Percy and Annabeth might have met a few." 

"So we have Greek, Roman, Norse, and Egyptian. I don't know how much more of this I can take. How about we go meet the rest of the Avengers? And the new groups." 

"Yep." 

The father-son duo walked over to the Avengers first. 

"So we have Thor," Tony pointed to the god and Peter looked reserved but not particularly intimidated. 

"Loki," This time Peter looked a little weary. 

"I can promise you child. I have decided to try and reform. I can't lie if I say that my son and daughter do not somewhat scare me at the moment," Loki calmed the spider. 

"Natasha Romanoff." Peter started bouncing up and down.

"Bucky Barnes." Peter was almost to the ceiling. 

"Steve Rogers." Peter calmed down a bit. 

"Bruce Banner." This time Peter actually jumped to the ceiling. 

"Oh my gods. You're Bruce Banner," Peter started excitedly. 

"Yeah I'm the-," Bruce dejectedly started. 

"The Greatest Scientist of your generation," Peter finished still giddy with excitement. Bruce looked shocked that someone recognized him for his scientific work instead of the Hulk.

"I have all your books. You know in your formula that turned you into the Hulk you calculated the mass wrong. It should  have been mass squared instead of mass cubed," Peter rambled. 

"You understand my work. What are you like twelve," Bruce questioned. 

"No I am sixteen Dr. Banner. I've read your work since I was able to read. It really isn't that hard." 

"Brucey Bear, Peter here is a child genius," Tony told the Doctor proudly. Tony ruffled Peter's hair. Peter jokingly whined, "Dadddd stoppp." The Avengers didn't take it as a joke.

"Tony is he your child?" Clint asked. Being the father in the group he knew the look Tony was wearing. It was the 'I love you kid and I'm very proud of you, but your going to make me go grey look,' Otherwise known as the dad look. 

Tony and Peter neither denied the claim nor confirmed it. Tony continued introducing the Avengers, 

"Clint Barton, Scott Lang, Hope Van Dyne, Stephen Strange, Gamora, Peter Quill," Tony rambled off. At Peter Quill's name though Peter interrupted. 

"There's a Buzzfeed Unsolved about you Mr. Quill. Did you know we also have the same first name. Your Peter and I'm Peter," Peter started rambling but was cut off by Tony finishing listing Avengers and moving on to the Norse demigods. 

"Alex Fierro son of Loki," Alex introduced himself. 

"Magnus Chase son of Frey," Magnus butted in before Tony could introduce him. 

"Oh Annabeth's talked about you before. She was devastated when she thought you were dead," Peter stated towards the blond. 

"Oh are you someone who goes to her camp?" Magnus asked. 

"Yeah, sorry. Peter Parker, legacy of Hephaestus and Athena. I mainly take after Athena and when I'm at camp stay in the Athena cabin." 

"Nice," Magnus nodded. 

"Uh.. I'll start us off again. I'm Amir Faldan just clear-sighted really." 

"Ooh cool. Not many mortals are clear sighted. What about you?" Peter turned to Samirah. 

"I'm Samirah Al-Abbas Daughter of Loki and a I am a Valkyrie." 

"Okay. Mr. Stark time to introduce you to the Seven. Magnus you wanna come and see your cousin? I saw her with Percy, Jason, and Piper by the drinks earlier." 

"Yeah, sure I'll come," Magnus confirmed. The duo walked off with a very confused Tony in tow.

The refreshments table was crowded thanks to the new additions to the room. No one knew if they were going to have enough tables for the kids who had filed in from the two Camps. 

"Hey Peter," Percy greeted as Magnus, Peter, and Tony came in sight. Upon noticing Magnus, Percy added, "Oh Hi Magnus. Nice to see you."

Annabeth turned around at the names of her two family members. 

"Hey guys? How is life treating you?" Annabeth asked. 

"Good...but Imayhavegottenthepowersofaspider." Peter sheepishly spit out. 

"Slow down, Peter" Annabeth calmed the younger boy, "What is it?" 

"Don't hate me but I may have some very spider-like traits now. Apparently my father made a spider that was genetically coded to my DNA when I was bitten by it on a field trip I developed Spider like traits and abilities," Peter jumped on the ceiling, "See?"

Some of the Athena children screamed at the sudden appearance of the upside down human on the ceiling. 

Annabeth turned away from the spider-child and towards her cousin, "How are you?" 

"I'm good Beth. I mean as good as you can when your dead and constantly dying every day," Magnus replied. 

Annabeth nodded her head. Magnus had a fair point. 

"How's Alex?" 

"He's fine." 

"SHE." Alex yelled to the two conversing demigods.

"She's fine." Magnus corrected. 

I need to post something because it is the day after Christmas. I'll bring in Harry Potter, Kane Chronicles, and Merlin in the next part. Over 1189 words. Hope you enjoy this first part.