Dandelo

Dandelo is a major villain in The Dark Tower series by Stephen King. He is an evil being of the same species as It. Whereas It feeds off fear, Dandelo feeds off laughter. He takes the form of an older man named Joe Collins.

History
Dandelo  used to be a Stand-Up comedian in the US. He would use his powers to steal life from people by making them laugh.

Dandelo ended up in the Prim, fairly close to the Dark Tower. He captured Patrick Danville and would regularly feed off him. He also cut out his tongue, and tortued him regularly.

Eventually, Roland, Susannah, and Oy ended up by Dandelo. Dandelo pretended to be a kind old man, and offered them hospitality. He offered to do a Stand-Up routine for them, and while they were laughing he drained their life.

Susannah started bleeding from a skin lesion and had to go to the bathroom. In the Bathroom, Stephen King left her a hint that Dandelo was evil.

Susannah came back and managed to break Roland from the spell. She and Roland then were able to kill Dandelo.