Woof (Mouse)

Woof is a main antagonist in the anime ''Mouse. ''He is a member of the black market and assassination organization, 4s, who was tasked to kill the famous thief Mouse. He is proven to be immortal and has two faithful female servants loyal to him: Fon and Rin Nyan.

History
He first debuts in episode 9 where he is seen talking to his unknown superior, who has summoned him to deal with Mouse once and for all. Woof boldly claims he understands, though he then states it will be the first time for him.

Woof eavesdrop on Sorata's college students at a restaurant, listening to Machiko's proposal to go on a date with Sorata, which he then smiles. Meanwhile, as Hazuki is going for a run, she suddenly encounters Woof's servant, Fon, and the two immediately fight each other intensely. Though evenly matched, Fon defeats Hazuki in the end. Another one of Woof's servants, Rin Nyan, appears before Yayoi and lures her, making her fall unconscious after ringing a bell in her hand.

Woof watches Sorata from on top of a building, happy to see his plan going into play. His two servants then appear before him, telling him that they succeeded their missions.