- 16 years old. - Male. - Has short brown hair and gray eyes. - Playful and sly. - Witty and quick-witted. - Serious when he needs to be. - Very close with Nana and Robbie. - Teases Robbie a lot but secretly looks out for him. - Wears a navy t-shirt with a cat on it and black pants. - Handsome.

- 14 years old. - Male. - Has short black hair and green eyes. - Timid, cries easily, and is a coward. - Thoughtful and caring. - Hates and is terrified of bugs. - Likes sweets (especially chocolate). - Close with Nana and Ross. - Wears a beige sweater with a teddy bear on it, a red scarf, and black pants. - Cute.

- 10 years old. - Female. - Has medium-length black hair and blue eyes. - Smart and assertive. - Quick-witted and cheerful. - Luke's younger sister; she follows him around and loves him. - Slightly jealous of Robbie (because Luke is nice to him). - Wears a blue headband and a blue dress with a rabbit on it. - Cute.

- 16 years old. - Female. - Has black hair in twin tails and red eyes. - Kind, friendly, and sweet. - Active, firm when necessary, and very considerate. - Takes good care of Robbie. - Hates fighting. - Wears a red sweater with black sleeves and a rabbit on it, and black pants. - Pretty.

- 15 years old. - Male. - Has short black hair and gray eyes. - Quiet, gloomy, and prickly. A tsundere. - Blunt and depressed (though his depression has improved a bit). - A former test subject. - Invincible and incredibly strong when his sclera turns red, but loses his strength when it's white. - Wears an eyepatch over his right eye, a black turtleneck, and black pants. - Handsome.