They have the same personality.

Consistently upholds a composed and impartial demeanor, yet occasionally interjects with irrelevant or humorous remarks, even in the face of serious situations. They demonstrates a keen inclination for exploration, actively seeking interaction with a diverse range of objects. When embroiled in combat, however, their personality undergoes a notable transformation, revealing an intense and ferocious disposition. With Caelus being aggresive and Stelle being stoic