Who is the Japanese voice actor for All Might?

The Japanese voice actor for All Might is Kenta Miyake.

Which anime is All Might from?

All Might appears in Boku no Hero Academia.

What role does All Might have in that anime?

In Boku no Hero Academia, All Might is listed as a main character.

Which anime does All Might appear in?

All Might appears in several anime, including Boku no Hero Academia, Boku no Hero Academia 2nd Season, Boku no Hero Academia: Sukue! Kyuujo Kunren!.

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All Might

オール・マイト

About

Birthday: June 10 Height: 220 cm (7'2") Affiliation: U.A. Quirk: One for All All Might is the No. 1 Hero and the "Symbol of Peace." He is famous for routinely saving the day with a smile on his face. In his hero form, All Might is a very tall and muscular man whose design resembles classic American superhero comics. His whole body has more shadows than a normal human being.

Spoiler Warning: Click to View

However, in his true form, he appears to be grossly underweight. During an encounter with a villain five years ago, he suffered life threatening injuries; the medical procedures that saved his life left him with an extremely frail physique. Now he can only serve as a hero for three hours a day, as his body cannot handle any more exertion.

Spoiler Warning: Click to View

All Might meets with All for One, the enemy who gave him his fatal wound, once more during the Hideout Raid arc. After a tough battle, All Might manages to defeat All For One, but ends up using all of his remaining power, ending his hero career once and for all.

(Source: Boku no Hero Academia Wikia, edited)