A 13-year-old orphan and leader of the human survivors. He possesses the Cosmic Hand, a merged monster tentacle that theoretically grants him telepathic control over zombies, though he struggles to master the ability. Burdened by his recent failure to stop the Tower's construction, he worries about his capacity to protect his friends and his place in a post-apocalyptic world.

Jack's 13-year-old best friend and the team's resident scientist and inventor. He wields the Conjurer's Cannon, a device he continuously tinkers with to produce unique effects in battle. Level-headed and analytical, he maintains a quiet confidence that balances out Jack's impulsiveness.

A small, pink slime monster known as a charming rogue. She possesses a long history as a thief and scammer, making her a wanted criminal by local enforcers. Despite her chaotic energy and tendency to stop at roadside attractions during emergencies, she serves as an essential guide for the human survivors.

A "mad doctor" monster who leads an army of scientifically modified, stitched-together creatures. He values grotesque aesthetics and uses experimental surgery to enhance himself and his minions. He holds a bitter grudge against Jack from a previous encounter and actively seeks revenge.

A hulking, physically intimidating monster who previously posed as Jack's ally. He acts as the chief architect of the Tower meant to bring an apocalyptic entity into the human world. He was once a leader of the Great Champions who fought for good, a historical fact that deeply unsettles Jack.

A malevolent, world-destroying supernatural entity banished in ancient times. He is responsible for the zombie plague and the monster vines that caused the apocalypse on Earth. He relies on his loyal servants to construct a dimensional Tower to allow his return.

A 13-year-old survivor and former high-achieving student with dreams of becoming a journalist. She deeply misses her parents and holds onto the hope that they survived the apocalypse. She stays behind in the human world to search Mets Stadium for her family while others enter the portal.

A former school bully who has transformed into an integral, protective member of Jack's crew. He possesses immense physical strength and acts as the group's primary physical defender. He stays behind with June to help search for human survivors.

A giant, zombified starfish monster infected by the zombie plague. Initially forced to fight travelers for the gorblins' entertainment, she harbors a strong hatred for her captors. She communicates her feelings and desires through telepathic mind-doodles.

An interdimensional pirate known as a Rifter who allies with whoever holds the most power. He captures unconscious humans for Thrull to prevent them from interfering with the impending invasion, motivated entirely by the promise of future rewards.

A Winged Wretch, a dragon-like monster allied with the human survivors. She possesses the ability to connect to June's thoughts and memories, using this bond to help locate potential human survivors in New York.

An all-knowing monster residing in the monster dimension. He serves as the primary goal of Jack's quest, as the human survivors believe he can help them interpret a terrifying vision.

Jack's loyal monster dog who travels with the group. He serves as a reliable mount and faithful companion during their journey toward the Tower and into the monster dimension.

A member of the Goon Platoon, a group of monster friends who were pulled into the monster dimension. He participates in a chaotic battle and directly saves Jack from being modified by Wracksaw.

A member of the Goon Platoon who battles Wracksaw's forces. Along with the rest of the platoon, she helps fend off attackers while riding a giant creature.

A member of the Goon Platoon. He defends Jack from monster hornets and provides crucial information regarding Shuggoth's location in Hidden City.

A monster tour guide at a historical monument. She provides Jack with unsettling information about Thrull's heroic past before delivering a strange, ominous warning about Hidden City.

A scientifically altered minion of Wracksaw who searches vehicles. She can physically merge with another minion, Eye-Bulb, to form a grotesque, powerful entity called Debra-Bulb.

A minion serving under Wracksaw in the monster dimension. At their master's command, they possess the terrifying ability to physically merge with Debra.

A friend traveling with Jack's crew who organizes activities to keep the group calm and distracted while they wait for the skeleton army to pass.