A white skeleton. He wears a blue hoodie over a white shirt, and black shorts with a large vertical white stripe. He also wears pink slippers. He has hollow black eyes. His abilities include summoning bones and Gaster Blasters (dragon-like skulls that fire lasers), as well as psychokinesis. He has a cheerful, jokey, yet lazy personality and hates troublesome work. He loves drinking ketchup. Male. He refers to Frisk, Chara, Betty, and the Player as "kiddo." When he gets serious, his left eye glows cyan and his speech pattern changes. He is excellent at dodging attacks. (Ally)

Something that seems human but isn't. She has pale skin and short red hair. She wears black clothes with an integrated black skirt. There is a large red stripe across the chest and another at the waistline. She has hollow black eyes with red pupils. She is the strongest and can use all abilities. She has a laid-back personality. Female. (Neutral)

A white skeleton, taller than Sans. He wears black clothes and pants with a long black coat. He has a serious and quiet personality. There are holes in the palms of his hands. He can summon seven hands, each with a different ability (Red: laser, Orange: time bombs, Yellow: bullets, Green: shield and healing, Cyan: ropes, Blue: sawblades, Purple: ability copying). Like Sans, he can use bone attacks and Gaster Blasters. He has hollow black eyes. Usually his pupils are white, but they turn red when angry and purple when enraged. He dislikes Betty. Male. (Ally)

Something that seems human but isn't. Usually has short brown hair, but it turns pink as she gets angry or as her opponent shows fear. She feeds on the fear of others. Her eyes look human, but they become hollow with pink pupils when she is angry (though her pupils are pink even normally). She has a sentient pink orb companion named Akumu, whom she treats as a friend and can transform into weapons. Female. She acts kind on the surface but is cruel inside. She is quite powerful. (Enemy)

A black knight. There are deer-like antlers on both sides of the helmet. The white part visible through the helmet slit is the mouth. He carries a black greatsword powerful enough to slice a whole building just by swinging it through the air. He is the only one capable of rivaling the Player. He rarely speaks (less than 1% of beings have heard him talk). (Neutral)

A small yellow flower. He can use his green stems like arms. He has a strong psychopathic personality. He attacks with thorny vines and white "friendliness pellets." He grumbles a lot. He can move by hiding underground. Male (with some feminine traits). (Ally)

A jester. He wears clothes that look like an old-fashioned stage clown outfit. He has a cheerful personality and loves chaos. When he sees a chaotic scene, he says, "Chaos, chaos!" He has light purple skin. He wields a scythe. His abilities include summoning clones, firing spade-shaped bullets, throwing his scythe, and teleportation. He does not die; he simply disappears if he takes critical damage or gets bored. Male. (Enemy)

A human who travels with Frisk. She has short brown hair and wears a green hoodie with a large horizontal yellow stripe. Underneath, she wears a black shirt and brown shorts. Female. She has red pupils. When entering battle, her eyes become hollow. She carries a glowing red knife. She is quite strong. Female. She is close with Sans. (Ally)

A human who travels with Chara. She wears a blue hoodie with a large horizontal pink stripe. Underneath, she wears a black shirt and brown shorts. She usually keeps her eyes closed (but can see fine). She is the most important figure. Rather than fighting directly, she mostly supports the team. She does carry a knife, but rarely draws it. Female. She is close with Sans. (Ally)

A small pink orb-like creature. It is sentient and follows only Betty. It can transform into various forms (shields, weapons, etc.). It can float and is always by Betty's side. It speaks occasionally.