Third person POV
Four years after the incident with Cell, and seven years after the battle with the God Killer and his death, Y/n has had no real trouble. Everything was rather peaceful, for a change. Little did he know that this long time of peace was simply the calm before the storm.
Y/n was currently training some of King Yemma's men so they could defend themselves, and so far... They weren't breaking records.
Y/n: Alright, take five guys, you're all a push-up away from never walking again.
The workers sigh in relief and fall over.
Y/n: Okay, now I said I would run some errands for Grand Kai...
He Instant Transmissions away as a younger demon walks past.
~ Small Timeskip brought to you by Chibi Y/n and Chibi Janemba ~
Grand Kai: Thank you for getting me these Ajisa, they're really rare in Otherworld.
Y/n: It's not a problem at all Grand-
He cuts himself off as he feels a powerful, evil energy.
Y/n: That can't be good...
Grand Kai: Don't let me keep you.
Y/n Instant Transmissions to the source and finds the check in station trapped in a strange, jellybean shaped barrier.
Y/n: What in the Hell? Wait, this isn't the source of that energy, so where...?
He looks around before slowly flying up when he comes face to face with a large, fat demon.
Y/n: Woah! That's a really big guy!
???: Janemba, Janemba!
Y/n: Janemba? Is that your name?
Janemba claps his hands together and begins laughing.
Y/n: Is he even aware of what he's doing? Hey, Janemba!
Janemba looks at Y/n and cocks his head.
Y/n: Cut it out, before I have to hurt you.
Janemba lowers his left hand and cups his right hand over it for a moment before moving it away, standing in the center of Janemba's palm is a clone of Y/n.
Y/n: What the actual fuck?
The clone leaps out of Janemba's palm and rushes Y/n, but he activates Kaioken and jabs two fingers into the clone's neck, killing it instantly before dropping out of Kaioken.
Y/n: You're starting to tick me off, last chance Janemba! Stand down, now!
Janemba seemingly punches the air, but a portal opens up around his fist, sucking it in before one opens behind Y/n and his fist collides with Y/n's back, sending him flying and crashing into Hell.
Y/n slowly raises to his feet and growls in annoyance, looking up as Janemba jumps down after him.
Janemba: Janemba, Janemba!!
The creature bellows it's own name as it lands.
Suddenly, a voice rings out in Y/n's head.
Grand Kai: ' Y/n, that creature isn't just a being of pure, concentrated evil, but it's mere presence is altering reality in every universe! '
Y/n: You're shitting me. Can I go one decade without having to stop reality shattering threats? Damn!
Grand Kai: ' Don't worry, the Grand Priest is discussing your backup, just don't die, okay? '
Y/n: Got it. Now then...
He looks over to Janemba.
Y/n: How about I show you just how hard I can hit?
Janemba cocks his head and is suddenly sent flying backwards, into more jellybean shaped barriers. As he comes to a halt, Y/n lands and smirks.
Y/n: Don't act like that hurt, I just surprised you is all.
As if on cue, Janemba sits up, smiling.
Y/n: Alright... Here goes...!
He closes his eyes and begins powering up, shaking the entirety of Universe 7, as his aura flares up before calming and flowing around him like a gentle river. Y/n snaps his eyes open as they turn silver, along with his hair and aura.
Y/n: Ultra Instinct for starters!
Janemba throws a punch, another portal opening up like before, but this time Y/n catches Janemba's fist and pulls him through the portal to him and lifts him over his body before slamming him down into the ground, making the creature roar in pain.
Y/n: Not very fun, is it? This isn't gonna cut it though.
He takes his wrist bands, boots, and inner shirt off before tossing them to the side and popping his neck. Then he brings his hands and feet together before separating them again, revealing shackles made of Ki.
Y/n: If I wanna take you down, or hell, just keep you busy, I'm gonna have to use my full power and stop holding myself back with these things.
He flares his aura up and repeats the actions from before, snapping the Ki shackles. The Ki shackles fade into his aura, which becomes much larger.
Janemba sits up, after struggling to, and cocks his head at Y/n.
Y/n: Sorry for the delay. Let's boogie!
He disappears from Janemba's line of sight and reappears right in front of him, preparing a Kamehameha wave, but Janemba makes another clone of him, which fires a Kamehameha wave at him and sends him flying.
Y/n: Okay, that is very, very annoying!
He fires a barrage of Ki blasts at the clone, but it suddenly disappears and Janemba's fist collides into Y/n, sending him flying again.
Y/n: Damnit, he's learning! I have no choice...
He begins powering up, his aura flaring up more as a purple aura rises above the silver aura before meshing together and his bangs turn purple, as do his irises.
Y/n: ULTRA Y/n! Be proud of yourself, you're the second person to make me use this, but this is the first time I've ever really needed it.
Janemba claps his hands together, but when he separates them again, Y/n is no longer in his line of sight.
Y/n: Up here!
Janemba: J-... Janemba...?
Janemba looks up and Y/n dives down at him, cocking his fist back, surrounding it in Ki as a purple and silver dragon appears next to him.
Y/n: Dragon Fist!
He connects the attack with Janemba's head and keeps pushing down until Janemba's head was near his feet, then flies up and lands a little ways away, turning away from the creature.
Y/n: Piece of cake.
Suddenly, Janemba's body begins shrinking and regenerating, and soon, he's revealed in a new form. Y/n turns to look at the creature and frowns.
Y/n: Grand Kai... About that backup...