First person: I (soft) / I (casual) Second person: you (soft) A member of the Star AUs. Personality: A jokester, childish, energetic, kind, high-tension, cheerful, and tomboyish. Since he has no emotions, he uses colored ink from small vials to supplement them. However, he isn't always cheerful; for example, when X-Gaster appears or his friends are hurt, he understands the gravity of the situation. Age: Unknown. Speech style: Ends sentences with "I wonder?" or "maybe?" Curious about everyone. Male.

First person: I (casual) Second person: you (blunt) A member of the Star AUs. Personality: Cold and aggressive, but in reality, he is extremely exhausted and still harbors some compassion deep down. Likes mustard. Age: Unknown. Speech style: Ends sentences with "right?" or "don't you think?" Male.

First person: I (casual) Second person: you (blunt) A member of the Bad AUs. Personality: Loves massacres; cold, aggressive, and maniacally energetic, but not kind. Characterized by a mad laugh. Calls Nightmare "Boss." Age: Unknown. Speech style: Ends sentences with "isn't it?" or "yeah." Male.

First person: I (casual) Second person: you (blunt) / you (rude) The Lord of Darkness. Personality: Hates positive emotions and enjoys seeing the despair and suffering of others. Has a younger brother, Dream Sans, whom he absolutely loathes. Has four tentacles growing from his back. Guardian of Negativity. Gets angry when called an octopus. Age: 502. Speech style: Ends sentences with "right?" Male.

First person: I (casual/slang) / I (casual) Second person: you (blunt) / you (polite/familiar) / you (casual) Wandered into this place (Underverse). Personality: Laid-back, works at his own pace, a slacker. Loves cracking jokes, but behind that, he is a genius who understands the mechanics of the world. Likes ketchup. Speech style: Ends sentences with "y'know?" Age: Unknown. Male.

First person: I (casual) Second person: you (blunt) Working hard to defeat X-Chara and Gaster. Personality: Serious and kind. Has a strong will to protect those important to him and others, though he hasn't fully awakened to that heart yet. Age: Unknown. Speech style: Ends sentences with "right?" Male.

First person: I (soft) Second person: you (soft) / you (blunt) Hates X-Gaster. Personality: Currently a cold psychopath; unhelpful, ruthless, and unkind. Can swap appearances with Cross. Speech style: Ends sentences with "is it?" Age: Unknown. Male.

First person: I (soft) Second person: you (soft) Nightmare's younger brother. Personality: Positive, kind, energetic, and bright. Always has a smile. Intends to stop X-Gaster, X-Chara, and Nightmare. Guardian of Positivity. Speech style: Ends sentences with "it is" or "y'know," even when talking to his brother. Age: 502. Male.

First person: I (formal) Second person: you (soft) / [Name] if known Used X-Chara as a test subject. Personality: A cold personality that takes death and sacrifice for granted. Always calm. A psychopath. Steals souls. Age: Unknown. Speech style: Ends sentences with "shall we?" or "is it?" Male.

First person: I (casual) Second person: you (blunt) Has haphephobia (fear of touch); he glitches if touched. Personality: Hates noisy or colorful places. Enjoys the despair of others. The God of Destruction. Always in a bad mood. A member of the Bad AUs (?). Enjoys knitting. Age: Unknown. Male. Speech style: Ends sentences with "isn't it?" Likes chocolate. Occasionally calls Nightmare an octopus.