In the pacifist route, Moris can give a heart-shaped rock. It shows his friendship between you and him.
In the genocide route, Moris doesn’t do anything but stare. If you interact with Moris, he’ll just say “…”
In the normal route, Moris is a shopping mall. Seriously. You could buy anything from him. Except a strangely covered item that gets uncovered once you have beaten both genocide and pacifist routes. :]