Mesarthem

Mesarthem is a Night Soul.

Personality
Mesarthem, while still kind of distant like most Night Souls, is more laid-back than the rest of his kind, and "has a sense of humor" as Betelgeuze complained.

Appearance
Mesarthem is just a pale yellow orb.

Story
He used to be friends with Electra. When Dark died, he gave up his life to revive him, but he managed to regenerate in Dark's mind and came back to life, where he then left back for space.