This is what house you (the reader) would be placed in, not any of the characters because they already have their houses). Please don't be offended by this, it is only for fun.

James: Ravenclaw

Sirius: Slytherin

Remus: Gryffindor

Regulus: Hufflepuff

Peter: Hufflepuff

Lily: Ravenclaw

Marlene: Slytherin