Undertale

The Protagonist & CatalystsFrisk: The silent, eighth human child to fall into the underground, whose intense Determination gives them control over saving and resetting the timeline.Chara: The first human child who fell years ago, whose lingering spirit attaches to Frisk and seeks absolute eradication if a violent path is chosen.The Royal FamilyAsgore Dreemurr: The tragic King of the Monsters, a gentle gardener forced by his people to harvest human souls to break the magical barrier.Toriel Dreemurr: The fierce, maternal former Queen who fled to the Ruins to protect any human children from Asgore's death decree.Asriel Dreemurr: The deceased prince of the underground, who died refusing to kill humans and was later resurrected as a soulless flower.Flowey: A sentient golden flower injected with determination, carrying Asriel's memories but entirely devoid of a soul or empathy.The Skeleton BrothersSans: A lazy, pun-loving sentry who hides a profound cosmic apathy because he is secretly aware of the timeline's continuous resets.Papyrus: Sans's eccentric, loud younger brother who dreams of joining the Royal Guard, yet remains completely innocent and full of pure optimism.The Military & Scientific FiguresUndyne: The fiercely patriotic, unstoppable captain of the Royal Guard who can tap into natural determination to defend monsterkind.Dr. Alphys: The deeply insecure, anime-loving Royal Scientist crushed by guilt over her failed experiments that created the monstrous Amalgamates.Mettaton: A narcissistic, glamorous robot built by Alphys who lives for television ratings and serving as the underground's sole celebrity.