Underswap!Chara is the main human character of Underswap. Living a normal life in a pacifist timeline, their curiosity for Cross!Chara lead to nearly all of their soul to be handed over to them, allowing them to overwrite for the first time since. His abuse, however, cripples the timeline, and Nightmare!Sans killings leads to not only their death, but the timeline as well, causing many issues in the long run with the Underswap characters living in that timeline.