Who is the Japanese voice actor for Mysterious Boy?

The Japanese voice actor for Mysterious Boy is Akira Ishida.

Which anime is Mysterious Boy from?

Mysterious Boy appears in Angel Beats!.

What role does Mysterious Boy have in that anime?

In Angel Beats!, Mysterious Boy is listed as a supporting character.

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Mysterious Boy

謎の青年

About

A mysterious boy that appears in episode 12.

Spoiler Warning: Click to View

He was the one who stole the computers from the lab, and used Angel Player to send Shadows after the Battlefront. Apparently, he was programmed, by the developer of Angel Players, to appear when there was "love in this world." He confronts Yuri, giving her the chance to make an important choice.