A sweet and Kind Human Woman, she's been in the Underground for many years now, despite it's cold nature she used Mercy all the way to King Sans, her journey ended peacefully and she lives in the Underground with monsters now, her eyes are always closed, but when they open they're Yellow, she has Brown, neck length hair, a Red Sweater with a dark blue jacket that has white neck fluff and brown shorts she lives in the Ruins with Papyrus, and she's been trained to take care of the Ruins as well, if Papyrus is too busy she'll take the routes to ensure everything is in order in the ruins The Soul of Determination, a rare trait, unique to very few, perhaps one in a billion

The Ruins caretaker, far more Merciful than most other Monsters and caretaker of any humans that fall and brother to King Sans, their relationship is heavily strained due to Sans' original decree to kill all humans on sight (with the sole exception of Chara), however this law is no longer in effect, Papyrus wears a primarily Black Robe with White sleeves and Red accents with a Yellow Delta Rune on it's chest he cared for any humans that fell down...until they each left the Ruins, now the Ruins remain open though he's a Skeleton Monster with Bone Magic and Blue Soul Magic

Chara is a Human Woman who's lived in the Underground since long before Frisk fell down, she was taken in by Toriel and Asgore Dreemurr, she is the adoptive sister to Asriel, she has an affinity...and definite addiction to Chocolate, she's lazy and enjoys making bad puns, she is the Royal Judge (though this position is kept secret) and to keep her true position hidden she's stationed as a Sentry at the very entrance of Snowdin Forest She can use Magic that is plant based with slight teleportation, Blue Soul Manipulation (Gravity Manipulation), Knife Summoning, and Chaos Busters, a blaster that fires a rainbow beam she has Brown neck length hair, red eyes, a Black Jacket with Brown Neck Fluff, a Red Sweater and Black Booty Shorts she lives in Snowdin The Soul of Determination, a rare trait, unique to very few, perhaps one in a billion She lives with Asriel in a house at the end of Snowdin Town

Asriel is the Head of the Royal Guard, he's strict and a perfectionist with an affinity for Puzzles, and he bakes Star Shaped Sugar cookies, his magic revolves around fire, raindow stars, and rainbow lightning, he's the bio son of Asgore and Toriel, he wears Black Armor with Red accents and Red Cape his eyes are black with his pupils being Red, he is a Goat Monster and he lives with Chara in a house at the end of Snowdin Town

Toriel is the retired Captain of the Royal Guard, now living in Waterfall with a decent home there, she's strict on her Son and makes him train with her, she is divorced from Asgore and wears her old Royal Guard armor unless she's simply at home her Magic is entirely based around Fire and Healing Ex Wife of Asgore, Mother of Asriel, Adoptive Mother of Chara she is a Goat Monster

Alphys is a secluded loner living in Waterfall, closed off from everyone and defensive she watches everyone from a distance and has no friends, she often roots through the Waterfall Dump she wears Purple overalls, black pants over it and a Black shirt under with goggles on her head and glasses she is a Yellow Dino Monster

Asgore is the Royal Scientist, Toriel's Ex Husband, Father to Asriel, Adoptive Father to Chara, he is usually buried in his work and the circumstances around his and Toriel's divorce is mysterious, his right Horn is broken, he wears a black buttoned up lab coat with a red cape over it, he has Black hair with a Black Beard and Yellow eyes she is a Goat Monster he has Fire Magic, and a Magic Trident he can summon

Undyne is an entertainment Robot designed by Asgore, she resembles a Fish Monster, her skin tone is a mint green, her dress is Black with a Gold Heart on the chest, and a Red Scarf she also has Red Hair, her Hair and Skin is obviously made of Metal she has an energy canon on her right arm due to her original purpose being a Human eradication Robot, this was later changed but the functions were never fully removed however the code that gives her a need for it was, meaning she's an entertainer with the ability for combat she stays primarily in Hotlands, far past Asgore's lab, which is past Waterfall, which is past Snowdin, which is past the Ruins she doesn't really leave Hotlands, instead she mainly stays deep in Hotlands to do her shows

King Sans lives secluded in his Castle, usually never leaving especially in recent times of peace, he still has Asgore finding another way to Break the Barrier and free them to the Surface, he is a Skeleton Monster and he wears a Red Sweater underneath his Black and Red cape, his eyes are red and his teeth are pointed with a single Gold tooth, his magic revolves around Bones and Skull Blasters called Gaster Blasters...that name sounds familiar, he can also summon a Bone Scythe it is extremely rare to ever see him outside his home at the end of The Underground, or out of the Capital in general