All Might

All Might is Deku's trainer and the former #1 pro hero. He is killed by Thanos's snap in Infinity War, so he is only seen in Act III. His quirk (power) is One for All, which gives him extreme super strength which can be passed on to another person. However, he can only retain his strength for a short amount of time due to previous injuries.

Appearance
In his muscle form, All Might has long, blonde hair with two long tufts spiked up in the front. He wears a bodysuit in the colors red, white, blue, and yellow along with a blue and red cape. In his true form, All Might still has long, blonde hair, but the two tufts hang down and to the side. He is extremely tall and skinny in this form. In both of his forms, All Might has black eyes with blue irises.

Story
All Might, although only appearing in Act III, is a very important character. He fights with All for One, and later he uses up the last of his One for All Power to stop Thanos from snapping a second time. This is why Deku uses One for All along with the Infinity Stones to kill Thanos and his allies. All Might gives a eulogy during Deku's funeral.