Sairagin

Sairagin (サイラギン) (7,19): A giant child who dropped out of school due to poor math skills and was hired by Dongoros to attack the city as part of his plan to take out the Land Gamma. Separated from the others, Kazumi is attacked by this monster until Five Black came to her aid. But once they found out he was just a kid, they decided to tutor him with his math if he stops being bad. This vexed Dongoros and he sent a Gorlin after him, but it was destroyed by the Five Robo before the cyborg could absorb the kid. After that, this monster left Earth and return to school with feelings for Kazumi.