Undyne

Undyne is one of the main and essential characters throughout the AU. She is encountered at the transaction of Waterfalls-Hotland, however she is not hostile unless attacked. Attacking her will cause the entire RDR gang to become rivals with Frisk.

She is completely chill towards anyone besides gangsters form other gangs, especially the EKB gang. She became Monster Kid's idol because of her victories after gang fights. This does not please her at all, as she tells him that it's not safe and appropriate for children.

Overall, she is a caring person that also cares about the safety of others. She also seeks to earn respect.

Childhood
Undyne was born in the Waterfalls, with her parents. She lived with her parents approximately for 4 years, until they died, protecting Undyne from humans who attempted to kidnap her. This resulted her to travel alone in the Underground by herself, until the Royal Guard police found her and put her into adoption. Eventually, an unknown widow adopted her.