These are all the character names and appearance changes. Asriel and Gaster pages are both WIPs.
Papyrus has jagged teeth and pitch black eye-sockets, with a crack along his right eye. He has a color scheme of red, black, gold, and silver. He wears a red cloak underneath a black one with a silver top and two gold stripes.
Sans' attire is a mix between Altertale and Underfell. He wears classic Toriel's robe and a black hood. The robe has red sleeves, a black torso with yellow lines down each side, and a red outlined golden delta rune. He wears black slippers and red pants. He also has a golden tooth.
Toriel wears a red dress and black "Underfell Sans" jacket. Her fur is white and she has goat horns. She wears a black necklace around her neck and grey makeup around her eyes. Her eyes are red and yellow.
Asgore wears his battle outfit on which he wears a long red scarf, a black shirt with golden buttons and spiked shoulders, black gloves with long spikes, and black pants. Asgore also wears red boots with black stripes and spikes and a red belt which has a horned skull in it. He has scar on the side of his left eye.