I wanna see examples of fights or moments where the main character achieves some kind of ultimate power.

Fights where the main character just snaps and unleashes his ultimate form or maybe masters some hidden technique.

The only examples i can think of are of Goku finally becoming a super saiyan and Kenshiro when he masters the Muso Tensei.

Bonus points if they have a cool and/or detached demeanor after achieving said power

I know this is /co/ but i just can't think of any other examples, help a nigga out here