Casper’s Scare School

A friendly ghost who longs to connect with others and struggles to 'scare enough' to satisfy the Underworld’s rules. He chooses friendship over fear and attends Scare School to learn balance. His kindness drives the story as he helps friends and outsmarts bullies while discovering what it means to grow up.

King of the Underworld who limits or supports Casper’s actions; he believes in balance and eventually grants Casper hope. He reveals a personal history and shows that being scary and growing up can be difficult. He serves as the ultimate authority who decides whether creatures can be friends with fleshies.

Two-headed headmaster who schemes to turn Kibosh to stone and seize control of the Underworld; He embodies the push for power and fear as tools for control. His plan to use a petrification potion reveals his willingness to harm others for personal gain. He represents corruption within the system.

Co-headmaster and partner in crime with Alder; participates in the plot to seize control, balancing his own ambitions with Alder's schemes. He acts as another obstacle Casper must outmaneuver. His role shows how fear can be amplified through charismatic leadership.

A mummy who befriends Casper and offers friendship despite unraveling issues. She is part of the ensemble of outcasts who attend Scare School and learn to trust one another. Her resilience shows that differences can be overcome.

Zombie girl who keeps falling apart, representing fragility and perseverance. She blends humor and vulnerability, forming a bond with Casper and Ra. She helps illustrate the theme of acceptance within an unlikely group.

A pirate who ferries the group to Scare School, serving as a practical ally and quirky guide. His presence adds adventure and humor while the others navigate the school's dangers. He helps move the plot forward with knowledge of the world.

Casper's talking parrot companion who provides comic relief and aids the group with information. His voice hints at the playful, easeful atmosphere at Scare School. He is part of the school's ecosystem though he isn't a student.

The school bully, a vampire who spies on Casper and tries to sabotage him. He embodies antagonism and the pressure to conform to a bully culture. His actions push Casper to prove himself.

Casper’s great-aunt figure who appears in the Valley of the Shadows; her presence connects the Ghostly Trio to the ancient histories of the underworld. She acts as an authority figure within banished residents and helps guide Casper’s understanding of fear and family. Her mannerisms add to the lore of the Scare School world.

One of the Ghostly Trio residing in the underworld; he participates in the school's events and adds a humorous dynamic. He embodies the quirky, friendly side of the Ghostly Trio.