Willy is a minor antagonist from the series Attack on Titan. He serves as head of a royal Eldian family living in the mainland of Marley. While the family initially kept out of conflicts they are in possession of one of the 9 titan powers, that being the Warhammer, the holder of which is kept secret from the public. Their family also secretly control the Marley govenment. During his position as head, his sister who inherited the Warhammer told him of memories she obtained, it gave him immense guilt over the origins of the Eldian bloodline which forced him to decide to help save Marley from their inevitable decline.

He is a man of average build with shoulder-length blonde hair tucked behind his ear on the left side and blue eyes as well as a faint shaven beard.

As an Eldian he's capable of becoming a titan however he does not possess a power himself. His notable skill is having political influence in affairs within Marley.