Alder and Dash are the two-headed headmasters of Scare School and the two (former) main antagonists of the movie Casper's Scare School, they also appear as recurrent characters in the follow-up tv series of the same name.
Appearance:
Alder and Dash are ,perhaps, the most strange-looking monsters in Casper universe: A two-headed creature with purple skin and tentacles for limbs, they wear a purple coat. Alder wears glasses a fez and a black tie, while Dash wears a bow tie and a graduation hat.
Personality
Both are rude and manipulative towards the students of scare school, and delight in causing the students and fleshies misery, Dash is cunning and smarter than Alder who is slower, clueless and a bit less strict, but has good ideas ocacionally.