Feldgrau

 He is a companion to an evil wizard, though he is not evil herself: quite the opposite really. He was unwillingly bound to him, and he has grown on him a bit. He longs for freedom, as he is slowly forgetting what free will feels like. He is a fully grown cat who used to be normal but once he became a companion he became immortal like the wizard.

He is forced to go on evil journeys with the wizard, and he does good along the way. He does all he can to sabotage his masters missions, and wouldn't even care if he gets caught doing so most the time, even with his carelessness his master is a bit of an idiot and never catches on to even the most obvious of hints. He is very smart and sly, but gentle and kind.