Brown or Grey
Hana Hime Arc
He appears along with the other members of the dangerous ability class helping punishing Natsume. Hajime is later seen fighting with Natsume by controlling insects. When Mikan and the others reunite with Natsume, Hajime uses a bug to bite Mikan under Persona's orders.
Hajime like the other members othe dangerous ability class parciptated in the horseback race carrying Nobara.
High School Divison Arc
Hajime is in the ESP's office along with the other members of the dangerous ability class as Mikan was being transferred to the dangerous ability class. Along with Rui, he becomes frozen when Nobara uses her alices on him.
Hajime has a insect pheromone alice, thus he is able to control insects. Unlike Ruka, where he hates to use animals for fighting, Hajime uses his alice mostly for fighting. He sometimes also uses his insects for healing such as what he did for Persona.