Sirius

Sirius Is a constellation given a 'physical'  form when accidentally summoned by Circe after an incident, He's silent and reclusive. He has quick reflexes and is not fully solid. He Can Easily appear as long as there is the night sky, seeping out of shadows and into his form when needed. 

Sirius doesn't blame Circe for his now complicated state, He understands that it was an accident but cannot comprehend why he's feeling a sense of emptiness he feels. Perhaps constellations should never be given the chance to be sentient, seeing the destruction Sirius brings when in these blank, empty states of mind.

Sirius doesn't have a lot of hobbies, and against contrary belief, he is not a fan of stargazing, as it makes him feel sad and isolated from the other constellations, who are happy and at peace without the troubles of life.