Morgana

Morgana is an amnesiac that remembers almost nothing about his past or himself, believing that the cause is the distortions within Mementos. This causes him to lose his sense of self in the process and wishes to get it back. Despite his appearance of a mysterious cat-like creature, he believes himself to have been human. He theorizes the core of Mementos may have the answers, but access from most of it is blocked and he cannot go very deep. In order to achieve his goal, he began to investigate the Metaverse and checked on numerous Palaces for clues.

Before being imprisoned and replaced by Yaldabaoth, Igor created Morgana out of the last remaining traces of human hope, and his role is to assist the protagonist in his journey.