Jack is a creative boy who adopts the alter ego of the Sorceress, finding confidence and power in a villainous, magical role. He frequently orchestrates evil plans and uses his younger sister as a minion, sometimes alienating others before learning to collaborate and form an army of allies.

Seth is a kind and patient boy dealing with the emotional weight of his parents' separation. He adopts the persona of the Gargoyle to watch over his house and protect his neighborhood at night, using play as a coping mechanism for his stress and exhaustion.

Sophie is an energetic girl who struggles under her grandmother's pressure to behave quietly. By adopting the alter ego of the Big Banshee, she reclaims a dismissive insult and embraces her loud, boisterous nature to defend her friends from bullies.

Egon is an intelligent, highly logical boy whose strict adherence to science makes it difficult for him to engage in imaginative play. He turns to self-help books to make friends before discovering that he simply needs to find someone who shares his interests.

Roy is a slightly older boy who feels pressured to abandon dress-up games and fit in with older teenagers. He lives with his grandmother and often directs his frustrations at the neighborhood children before finding acceptance among them.

Sam is Jack's younger sister who frequently serves as his loyal minion during their games. She is supportive of her brother and helps him improve his Sorceress costume after an embarrassing encounter.

The Knight is Jack's neighbor who initially offends him but quickly makes amends. Refusing to be cast as a traditional princess, she creates her own knight armor and becomes a steadfast ally in the neighborhood games.

Shikha is a responsible older sister who uses imaginative play to wrangle her sibling. Taking on the persona of the Huntress, she tracks her brother through the neighborhood and joins the ongoing backyard battles.

Vijay is Shikha's mischievous younger brother. He eagerly adopts the alter ego of the Beast, enjoying the thrill of being chased and engaging in battles alongside the neighborhood kids.

Alice is a business-minded girl who takes her entrepreneurial endeavors seriously. When faced with competition, she escalates the rivalry before realizing that collaboration is better for everyone, leading to the creation of the Dragon's Head Inn.

Becky is a creative maker who simply wants to build cool props for her friends. She eventually partners with Alice to co-manage the Dragon's Head Inn, though she secretly yearns to go on an adventure of her own.

Miguel is a thoughtful boy working through complex feelings and struggling to find a play role that suits him. Rejecting the traditional roles of a rescued princess, he creates the dashing persona of the Rogue, allowing him to authentically join the games.

Nate plays the Prince in the neighborhood games and is admired by Miguel. He also acts as a supportive older brother, helping to translate his younger brother's confusing costume into a monster that everyone can interact with.

The Animal Queen is a fiercely territorial but ultimately caring neighbor of Seth. She commands a kingdom of stuffed toys and learns to share her space, showing genuine concern when Seth disappears from their play sessions.

Amanda takes on the persona of the Mad Scientist, eagerly fixing her friends' problems with chaotic results. Her costume choices reflect her deep admiration for her father, leading to an emotional confrontation over cultural expectations.

Connie uses a robot persona and speaks in a monotone voice to shield herself from the social anxiety of making friends. With gentle encouragement from her dad, she takes a risk and invites the neighborhood to a robot-themed birthday party.

Peter is a dedicated builder who constructs an intricate cardboard city. When his creation is targeted by a bully, he chooses to adapt his game and invite the aggressor to play, turning a conflict into a powerful alliance.

The Scribe is a quiet, observant boy who enjoys documenting the adventures of the Cardboard Kingdom. He shares Egon's love of books and comics, providing a natural and easy connection.

The Blob is Nate's younger brother who initially struggles to communicate what his abstract cardboard costume is supposed to be. Once Nate helps modify the suit, he happily joins the older kids' games.

Meemaw is Sophie's grandmother, whose strict and outdated expectations about how girls should behave stifle Sophie's vibrant personality. Her criticisms temporarily cause Sophie to withdraw from playing.

Jack's mother is supportive but occasionally frustrated by the disruptive nature of his Sorceress persona. She tries to offer him an open, non-judgmental space to express his identity.

Seth's mother is working through a difficult separation. She attempts to comfort Seth and encourage him to play with his friends while handling the tension with her estranged partner.

Seth's father is separated from the family but repeatedly arrives at the house, causing disruption and anxiety. His volatile presence drives Seth to adopt a vigilant, protective alter ego.

Amanda's father is a caring parent who initially disapproves of Amanda's mustache costume due to his own cultural biases. He eventually realizes his mistake and supports her unique self-expression.

Connie's father understands her anxieties and speaks to her on her level. He gently encourages her to socialize by suggesting she host a robot-themed birthday party.

Roy's Nanna is his guardian who provides him with a stable, loving environment while his mother is unable to care for him. She handles his frustrations with patience and empathy.

Speedy is Seth's energetic dog. His tendency to run off helps break the ice between Seth and the Animal Queen, bringing them together to play.

Sophie's mother is an encouraging and affirming presence. She brings Sophie cardboard and validates her big, boisterous personality, directly countering Meemaw's restrictive expectations.