The Mysterious Boy is a young evil genius who created shadows for the NPCs and the main antagonist of the 2010 anime Angel Beats!.
The Mysterious Boy was using his computers to make shadows as NPC classmates to like kill all the SSS & try to change the world on his own. The Boy was still making shadows but confronted by Yuri for questions. The Boys asks Yuri that the World will be love & peace because love will exists in this world for all the NPC's to like do anything else in his life. The Boy wants to make the world into NPC cilvlians & change the world but killed by Yuri so the Boy won't try to rule & Change the World on his own.