The definition of chaotic neutral, Moose is wild, full of split-personalities, sex, cuddles, violence and cannibalism.
He jumps from grave seriousness to bubbly whimsy in a flash. He is a demon, but he is not one of evil. While he certainly is someone to be wary of, he is kind-hearted deep down. (And when caught in the right mood.)
Most of his life he spent living in abandoned carnival grounds, though in searching for adventure and saving Xander from destruction he left behind that place. He sticks by his lover and partner Xander, through thick and thin. The two are inseparable, and Moose's lively public affections make no mistake of that.
Moose also has a gender-bent female version of himself called "Elk" whom I use in small stories and when I feel like drawing a feminine figure. (Which I don't do often.)