One Piece: Unreal Adventure - Chapter 61: Baratie

When people die, where do they end up to?I don't know about anyone else, but when I died, I arrived at the strangest Heaven of all times. And I got a chance to reincarnate with all of my memories!Jackpot!If you look away from the fact I had to reincarnate as a damn monster which is the lowest of all the bottom feeders? And I had to represent one of the worst goddesses ever!?And to make things worse, my “birthplace” was a freaking Dungeon! And not your everyday Dungeon with level 1 slimes and goblins, but a freaking Dungeon-turned-world-destroying-facility!Still, you gotta work with what you have. So see me how I survive in this crazy new world!!...But I promise I won't be mad if the bosses get debuffed. No? Damn...

A teenager finds himself in the Marvel World with the Dragon Balls, and has to find a way to survive!

Shenron: “Say your wish! Any wish can be granted, but you only get one…”

Teenager: “Any wish could be granted?”

Shenron: “Of course!”

“Great!”

Teenager: “Shenron, please get me out of the Marvel World; return me to my original world!”

Shenron: “I’m sorry, I can’t do that…”

“….”

Teenager: “What? What were you bragging about then, saying you can grant any wish?”

Shenron: “Your body is from this world, therefore….”

“….”

Teenager: “Okay, then give me the power of a Super Saiyan! I want be able to beat Thor and Hulk, surpass Captain America and Iron Man!”

Shenron: “I’m sorry, I can’t do that…”

Teenager: “Worthless dragon! What can you do?”

Shenron: “I can…”

- Description from Novelupdates

A broken man who ended his own life finds himself reincarnated into the game he used to play. However, instead of becoming the protagonist or a powerful antagonist, fate places him in the role of a minor villain—a mere stepping stone for the protagonist in the game's first arc.

Life is often full of curveballs. It likes to keep you on your toes.But what can a regular guy do when he gets booted to a world full of gods, dragons, devils, angels, yokai vampires and everything in between with only the clothes on his back and a reality-bending gacha behind him?His best apparently.