Eutus (ユータス)

Eutus is a strange and mysterious man that wears a Wizard-like robe who the kids encounter wandering throughout the various dimensions of the Abenobashi Shopping Arcade. Eutus comes off as a wise know-it-all, and absolutely hates being called “Mister” due to the implied range in age, and would much rather be referred to as "Bro", or something similar. Eutus has a powerful connection to the Abenobashi Shopping Arcade which remains a secret, but in the meantime, he’s doomed to wander the various dimensions of Abenobashi until the cause of his misfortune is rectified.

[US official site]