You had just transformed into your Super Saiyan Devil Form as it was the only form you could use to harm Nega, the two of you faced each other as you began to silently giggle, thinking of all the ways you could potentially kill him

Nega: So, You wish to fight me...? Very well...come and face your fate...

Y/N: With Pleasure!!

The two of you suddenly dashed towards each other and clashed, causing a shockwave to burst and emit a powerful gust of wind

Issei suddenly ran behind a tree and hid there as he remembered what you did to him the last time you transformed into your Devil Form

Y/N: Now...What will I do with your corpse once I'm done with you...?

Nega: I assure you that it will be ME making a corpse out of YOU...

You suddenly laughed maniacally and punched Nega in the stomach, followed by a large dark blast the sent him flying out of the building

Y/N: Your Jokes are as amusing as your power...

You rushed after Nega as Whis and Vados raised their staffs and quickly repaired the damage done to the building

You and Nega were now in the air, exchanging blows as the two of you zoomed around the city, despite your very evil and violent nature, you made sure to avoid hitting any buildings and pedestrians, and kept Nega away from
then

Nega suddenly received a powerful blow to the face that sent him flying out of the city, you followed in hot pursuit of him as you readied your hand to blast him

Meanwhile

Lotus, Kasai, and all of the others were currently watching the fight from Whis' staff that projected a hologram that showed your battle

Midoriya: He seems more cold blooded then ever before...!

Issei: Brings back some VERY bad memories...!!

Whis: Indeed, the way Y/N's Devil form works is that the form is fuelled by the negativity built up in his heart, since he has been quite on edge lately, he's been wanting to let loose, turning into a Super Saiyan Devil was the perfect opportunity for him...

Mineta: I-I'm just glad he's still on OUR side...

Vados: However, this form does have a large flaw, as Y/N remains in this form, the negativity in his heart will begin to fade, and eventually run out, this "Nega" adversary, he isn't just taking blows, he actually absorbing the darkness from Y/N each time he takes an attack...allowing him to grow stronger while taking away Y/N's Dark power in the process...

Ren: I see...let's just hope that he can last long enough to win the battle...

Back To You

You were currently being tossed away by Nega as you went flying back and skidded across the ground on your feet, you eventually stopped and looked at Nega while forming a purple battle axe made of energy in your hand

Y/N: If you surrender now...then I'll make the slashing quick!

Nega: I'll never surrender by the hands of someone as pathetic as you...

You suddenly began to laugh like a mad man as your smile widened, you let out a loud roar and screamed at Nega

Y/N: I WAS HOPING YOU'D SAY THAT!!! HAHAHAHAHA!!!!

You suddenly rushed towards Nega and swung your axe at Nega, slicing right through his arm and cutting it off

You then stopped and turned around to see Nega's arm reattach like it was nothing, however this only made you happier as you got to slice him up more

Nega: My Body is completely made of pure dark energy...there is no flesh or bones to puncture...!

Y/N: I don't give a shit about that...I JUST WANNA CUT YOU SOME MORE!!!

You suddenly opened your mouth as it began to glow, you suddenly unleashed an unforgiving beam of energy from your mouth as Nega leaped into the air, avoiding the blast

You suddenly appeared above him and slashed your axe into Nega's shoulder, you didn't manage to slice right through as it stopped half way, taking you by surprise

Y/N: Wait...What?!?!

Nega suddenly grabbed your Axe and took it out of his shoulder as the wound healed instantly, he then suddenly thrusted the axe into your chest, he managed to get you with your one weapon

Y/N: G-GAH......!!

You gagged in pain as you suddenly spat out a bunch of blood that scattered all over Nega's face, cashing him to let you go as you fell to the ground

Meanwhile

The others had just witnessed you get impaled with your own weapon as you fell to the ground

Goku: Y/N!!!

Vegeta: THAT BASTARD!!!

Yang: I'LL KILL EM!! I'LL F**KING KILL EM!!!

Back To You

You were still falling as your body slowly reverted back to normal, dark smoke emitting from your lifeless body as Nega spoke up

Nega: Pathetic Earthing...

Hearing those words, your eyes suddenly shot wide open as you began to emit a bright red light, catching everyone by surprise as you were engulfed in a beacon of red energy

A part of your face suddenly emerged from the energy as you now had a smile on your face, but said not a single word

Nega: What's this...?

Meanwhile, a girl who was a complete stranger who was in an ice cream shop, eating a bucket of ice cream, looked out the window and saw the red energy even from the city, she smiled and left the building to investigate

You suddenly emitted an even brighter red light that engulfed the entire area and temporarily blinded Nega. Once the light faded, Nega looked towards you to see that you had almost completely changed

Nega: Interesting...

Your hair had grown the slightest bit longer as half of your hair was white, and half of your hair was black, one of your eyes being yellow like a super Saiyan 4, and another eye having a black eye ball and a red pupil with a black mark that went down your face a little, your axe had also changed to red sword made of energy