Crayon Shin-chan Wiki
Mashumaru Ujuin

Mashumaro Ujuin in the anime.

Mashumaro Ujuin (宇集院 魔朱麿) is the son of Ms. Ujuin. He comes from a very wealthy family. He goes to the Futaba Kindergarten and has a dog which he loves a lot. He appeared in manga volume 9, and in anime episode 114c "The parents interfere with the children fight" (子供のケンカに親が出るゾ).

He reappeared in episode 574b, where he was brought to the free classes that an English academy was off ering, and he met Shin-chan there. Both his mother and him hates Misae plus Shinchan and they hates them too respectively.