you people should learn about the goetic demons like for example:
this is prince stolas, he is a long legged owl demon who teaches knowledge about astronomy and herbs to anyone who conjures him
whats not cool about an owl demon
Or perhaps my favorite, Marchosias
They are a Marquis of Hell that is a wolf with wings and a snake for a tail that is a very strong fighter, and will answer all questions truthfully while being extremely faithful to those working with them.