Juroujin

The elderly member of the "Friday Club" is an active loan shark and is the oldest and most important figure within the club. He is known for recommending Benten as a new member, and he is also capable of using mysterious techniques.

This old man owns a private train, and given his profession, he is believed to be the same character as Li Bai from the author's other work, "The Night Is Short, Walk on Girl." However, in the anime adaptation of "The Eccentric Family," he is depicted with long hair, while in the manga version of "The Night Is Short, Walk on Girl" and in the "The Tatami Galaxy" OVA, he is portrayed as bald.