BUTLER appears to possess a refined-butler type personality, acting professional and attentive towards the things around him. This can be shown in one of OMORI's drawings where the BUTLER can seen tending to the former when he was sick. However, he can also be quite cold-blooded when delivering punishments to those that he thinks deserve it.

BUTLER could sound like a stereotypical butler personality, or they could sound similar to what MEWO would sound like if she could speak.