There are ten characters you need to befriend. They are:
Reggie (a floating, burning cow skull)
Charles (a jack-o-lantern with eyes)
Rachael (a floating skull wearing a cloak)
Spooksby (a fancy ghost)
Barney (a cool banana)
King Arthritis (a skeleton in a cauldron)
Cerebrum Gigantus (a floating brain)
Luceyefer (a demonic, floating eyeball)
Gabreyeal (an angelic, floating eyeball)
Dire Chad (a large spider)