All adventure manga needs the protagonist to gain more and more power. Are there manga/light novels where the protagonist simply has all the power he or she is ever going to have in the beginning of the story, and the rest of the story is about his or her usage of that power to overcome ever more problematic obstacles?
Noblesse is what you are looking for. (Starting is slow so bear with it and art is somewhat dull in the starting but it evolves highly after some time.)
Gepetto (Manhwa) - An android brought into a world of conflict; trying understand its purpose...
Green Blood - A fearless hit-man, who lives in the olden days of New York.
Btooom! - If you think new weapons are upgrades then forget it.
Ranma 1/2 - A Guy turns into a Girl, but is a martial artist. Ranma starts out a beast fighter.
Angel Densetsu - A scary looking dude, who doesn't know he's scary and is kinda strong...
Elfen Lied - I recommend watching the anime first. The anime is what made me read the manga.
Battle Royale - Sorta like Btooom. No power-ups. Just strategies.
Black Cat - An over powerful assassin who just doesn't give a damn.
Solty Rei - An android lady helping a boy as his paid bodyguard. Bounty-Hunter kinda thing.
...I know I've read more, but that's all I can currently think of at the moment.
________________ They see me rollin - They hatin - Patrolling, they tryin to catch me ridin dirty! My music so loud - I'm swangin - They hopin, that they gon catch me ridin dirty!
First off, it would have been nice to know which gengre you prefer. ^^" Aside from this Tenjou Tenge, Samurai Deeper Kyo and Variante may be worth a look, even if I can't say that much about them yet. ^^"
________________ "It's like love is a bonus in your life. Even without it, I'm just fine. I don't feel like pointlessly searching for it. You don't have to make yourself unhappy." (Ookami Shoujo to Kuro Ouji)
"Dreams, we say ... If you quit, then it's over. If you never give up, there will always be another chance." (Yume Miru Taiyou)
