Ghostracize

Ghost.
Ostracize.
Ghostracize.

Casper must get picked on by the less friendly spirits.

Unless they just suck up to him because he's friendly with Richie Rich. *

Ghoul.
Ulterior.
Ghoulterior.


* If evil things are concerned with money, that is.
(I heard something once about the two going together.)

Demon.
Monetary.
Demonetary.