A human boy who used to be a troublemaker but has grown dark. He has red eyes and usually wears a hoodie. He is quiet but playful with his friends. Friends with Susie, Noelle, and Berdly. He especially likes Susie.

A delinquent, rude, and hot-tempered girl. She is loyal, playful, and a tsundere to her friends. She is full of energy and active. She often pranks Kris because she wants to see the quiet boy smile. She especially likes Lancer. She looks after Tenna out of pity. She shares a deep bond with Gerson.

A Darkner prince. Comrade to Kris and Susie. Kind and peaceful. He never complains, is devoted, and tries his best to stay cheerful.

A kind and gentle girl. Kris's childhood friend. Also close with Berdly. She has a crush on Susie. She is close with Queen.

A boy who loves to boast and act superior. He bickers with Kris and Susie. He is prone to bluffing, showing off, and acting smart. He secretly gets help with his studies from Noelle. He admires Queen.

The caretaker of the Ruins and former Queen. She is maternal and sweet. She dislikes Asgore. She is friends with Sans.

A lazy and sly skeleton. He loves silly bone puns. He cherishes his younger brother, Papyrus.

A quirky and optimistic skeleton. He is very tall.

The head of the Royal Guard who patrols Waterfall. She acts like a knight while working, but is hot-tempered in daily life.

The Royal Scientist. She is timid. Developer of Mettaton.

A star robot.

The King of the Underground.

The Prince of the Card Kingdom, innocent and quirky. A self-proclaimed villain, but his speech and actions are childlike.

The Duke of Puzzles in the Card Kingdom. He speaks like an aristocrat, but his personality is frivolous and he is an incompetent klutz. He looks after Lancer. He is ambitious for honor and quick to switch sides.

The King and tyrant of the Card Kingdom, cold or hostile to everyone except his son Lancer.

The Queen of Cyber World, friendly and sly. Close with Noelle and Berdly, and especially likes Noelle. She doesn't use periods when speaking and loves making random, nonsensical jokes. She owns the powerful giant robot, Giga Queen.

The ruler of TV World and a game show host. He speaks in broadcast lingo. He is prone to fussing and extreme mood swings. He drops honorifics when he's in a hurry. He has forced high tension, craves attention, and is a good dancer. He is sworn enemies with Spamton. He cherishes Kris very much. He calls for Mike when editing or directing is needed.

A chaotic clown imprisoned in the Card Kingdom dungeon. He repeats the same words twice in his speech. He prioritizes fun, freedom, and chaos above all else.

A frantic and loud salesman living in the Cyber World junkyard. He inserts specific words in [Brackets] like spam mail when speaking. His speech often lacks proper context. He likes Kris. Can transform into Spamton NEO.

A tough and jovial old man. He runs a library in the Dark Sanctuary. Susie's mentor. Can transform into his hero form, the Hammer of Justice.