Who is Belch Huggins, Victor Criss, and Patrick Hockstetter from It and what is their importance?

Belch and Victor are good friends with Henry Bowers. Both men are killed by It when they follow Henry into the tunnels.

Patrick is also a friend of Henry's. He's a psychotic murderer, who killed his infant brother when he was in kindergarten. Patrick feeds his psychosis by suffocating live animals in his refrigerator. He is killed by It.