Wulf is one of the few ghost friends Danny has. It's hard to get a feel for his personality, as he is silent most of the time and when he does speak it in Esperanto. At first Tucker is the only other Esperanto speaker in the cast, and even he has trouble deciphering Wulf's speech. Wulf is very protective over Danny and would do anything to help him after Danny rescued him from Walker's goons.

Wulf is very strong and has the unique ability to literally tear a hole in between the Ghost Zone and the earth. This makes him a great ally for Danny and his friends, but this ability is also desireable to other ghosts such as Walker.