Czarodziej

"That kind of worried face is also wonderful! I'm getting excited!"

A man whose hobby is studying witches, he meets the protagonist and friends on their journey.
He was cursed by a witch and can transform into a ferret.
He's good at mixing medicines and can create the rainbow colored powder that can turn animals into humans.
He's known as the 'Dark Black Magician", but because of his strange way of acting Ryszard and the guys treat him like he's a pervert.

Spoiler

His real name is Reimer