Chara Dreemurr

Personality
On the outside, Chara's personality seemed to be one of playful curiosity. They quickly became good friends with Asriel Dreemurr, and moved on to become his adopted sister. However below, Chara's personality is much more twisted than the naked eye can see.

Chara harbored deep resentment towards humans in particular, expressing their hatred for them more than once. She held very radical beliefs, and carried much internal conflict. They wanted to try and help free all the monsters of the Underground, and they considered them to be some of the nicest creatures they had ever met. Unfortunately, their resolve to free monsterkind was too great, and in a failed attempt, they paid the ultimate price.

Backstory
Chara was very quiet when it came to their past. In fact, nobody really knows what they went through, or why they felt the way they did. What we do know is they had a very troubled life on the surface before falling into the Underground. It is presumed that Chara lived in an abusive household on the surface. They also hinted at having done something terrible, and there are some who speculate that they killed one, or both of their parents before attempting to commit suicide by jumping into the Underground.

However, all of this is mere speculation. Investigations were launched into trying to find out more of their past, but since they were never open about it, this is a secret that tragically died with Chara.