Chujin

Chujin was a purple furred, anthropomorphic fox-like monster with brightly purple colored hair tied in a small ponytail. He wears large, circular, green glasses as well as a green montsuki with yellow accents.

Chujin is said to have been a kindhearted and hard-working monster, and a good mentor. His philosophy was that even though monsterkind is in a bad spot, being sealed off from the surface, monsters can collectively make the Underground a better place through little acts of kindness.

However, Chujin was very mistrustful of humans. He believed that humans are dangerous and they can not be trusted. This is largely due to a past incident in Snowdin, which involved a human attacking monsters. Specifically, this was the human child with the blue SOUL (Integrity), who had fallen into the Underground. They happened to attack a monster who was with Kanako, Chujin's daughter. Kanako herself was not hurt, but Chujin was shocked to hear the news nonetheless. He felt that his daughter could have died that day, and he wasn't there to protect her. This incident, coupled with the knowledge about the Great War between humans and monsters, is likely responsible for Chujin's attitude toward humans.

Despite this, in his secret VHS tape, hidden behind his tombstone, he laments the fact that one of his creations accidentally ended up killing a human, and appears to be very regretful. This shows that Chujin did not completely hate humans, and doesn't wish death upon them. Thus, it is likely that Chujin could have changed his point of view if he were to meet a kind human (like Clover on the pacifist route). However, it is notable that Axis' presence before the attack means that though Chujin may not have wished death upon humans, he did still intend to produce weapons to use against them even before the attack.

Through his recorded journal, Chujin is shown to have been arrogant and stubborn. He does not admit to his mistakes and hides his firing from Ceroba, as well as his plan involving a human SOUL from everyone until his death. He dedicates himself entirely to his work and uses his dying wish to burden Ceroba with finishing it, showing that he is very adamant about his plan being the key to saving monsterkind.