'Kay so answer the question. The only thing is it doesn't mean your directly affiliated with the story of the manga, just the rules of physics and history. Like Dragonball (superpower, aliens, dragonballs and etc.)
I would have to say the Tenjou Tenge universe. The powers in it aren't too over amazing like earth shattering stuff. Plus there is such a plethora of abilities to have. I also love martial arts.

Layhe already made a thread like this. ;D

source: animenewsnetwork

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Damn, I searched pretty hard too.

EDIT:Now looking at it though his post was more directed to interacting with the characters in the story. I'm saying without being directly affiliated with the characters.

You could still post it in the other thread...

A just ruler amongst tyrants

well...you gonna lock this or not Lamb?

Like i said before, i want to be in the bleach universe so that i can see what kinda spirit powers I'd have xD

Quote from fallofkakashi

well...you gonna lock this or not Lamb?

Woops...Now it's locked~

A just ruler amongst tyrants