Impulse

Impulse is a wolf-like cryptid that lives in the crypt. As his name implies, he can be quite... Impulsive. This isn't a bad thing though, while he can be rude, and snappy sometimes, he doesn't mean it. Well, most of the time, anyway. Impulse is good with children, along with his brother, Will. They kinda have to be, you see, Impulse is actually just the mask, the body is a human's body that has been distorted and taken over by the mask's power. Since the body is human, it grows old, and eventually will die. Before the body dies, Impulse will sneak into the human world. and convince a child to put on his mask. When the child does, the child's body becomes Impulse's new one, and an old person's corpse will be left in the child's bedroom. Police, not knowing who stole the child, or left the corpse in the room, call this the Benjamin Button case. If the child is really kind to Impulse when he visits, he will leave them alone, and find another child to take instead.   

(He is my fursona by the way!!)