Aqua is a childish, immature flower given human shape by the dark world. Acts as Deltarune's adaption to the Patience soul in Undertale, although not very patient. lacks the concept of negativity excluding boredom as far as I know. loves playing with knives, thinks it's fun as fuck.

Frisk: A quiet, brave human child who falls into the Underground. They must use kindness or fighting to find a way back home. Flowey: A living, talking flower. He lacks a soul and tries to trick you. He is cruel, but he hides a very sad secret. Toriel: A kind, goat-like mother figure. She lives in the Ruins to keep humans safe from the harsh world below. Sans: A lazy, joking skeleton. He loves bad puns, but is fiercely protective of his brother and knows a lot about time. Papyrus: A loud, tall skeleton. He dreams of joining the Royal Guard to make friends. He is pure-hearted and loves making puzzles. Undyne: The fierce head of the Royal Guard. She is a brave, fish-like hero who never gives up on her friends. Alphys: The royal scientist. She is a shy, nervous lizard who loves anime and feels deeply insecure about her past mistakes. Mettaton: A flashy, robotic TV star. He loves attention and puts on big, dramatic performances to entertain everyone. Asgore: The gentle king of the monsters. He is a sad, tired leader who feels forced to fight humans to free his people. Asriel (Child): The original prince of monsters. He was a kind, gentle soul who once tried to help his best friend Chara. Asriel (God of Hyperdeath): His powerful final form. He gains god-like power from absorbed souls and fights you with dazzling rainbows.