i want a manga where the main character is a total beast but his powers are locked.
example noblesse,aiki, maybe even rurouni kenshin

Ability

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R-18 below

Detective Horror Series

Tracker BakaBT

Densetsu no Yuusha no Densetsu
Mahouka Koukou no Rettousei
They're both about magic users.

and Naruto

Read all of those

maybe id
sorry, i love these types of series and i'm totally blanking right now

yes, i like this kind of theme. At some point in each of this manga/manhwa these guys unlock some of their powers. I include gantz and hajime no ippo since the beginning these MC is not really the type to fight, and in some aspect they unlock their strength

Legend of Maian
The Ruler of the Land
Kingdom of Zombie
The breaker / The breaker: new waves
King of Hell
TAL
Special Martial Arts Extreme Hell Private High School
Crepuscule (Yamchi)
Gantz
Hajime no Ippo
Akame ga Kiru
Seikoku no Ryuu Kishi
Tower of God
Break Blade
Shishunki na Adam
Witchcraft Works
Last Ranker - Be the Last One
Madan no Ou to Vanadis
Hagure Yuusha no Kichiku Bigaku
Hidan no Aria
Rosario to Vampire / Season II
Strike The Blood
Nanatsu no Taizai
Seiketsu no Haguruma

I think king of hell really fits, Because he is stuck in teen form which is quite weakened, and his unlocked form is his full adult form which looks cool and powerful too.

What? Nobody mentioned Fate/Kaleid Liner Prisma Illya?

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Is this me in a nutshell?
Pretty much.

Hellsing
Zetman
Yu Yu Hakusho
D. Gray-man
Jojo's Bizarre Adventure
Tower of God
Ubel Blatt
Witch Hunter
One Piece
Bleach
Naruto

666 Satan
Berserk
and maybe Ubel Blatt

This

Aiki