The once mighty and kind ruler of the monster kingdom, Asgore was murdered by Flowey before Sans could step in and stop him. A memorial was erected in the throne room in his stead, which was, by tradition, sprinkled with his remains.
Took her place as queen after Asgore’s fall. Murdered the night Flowey succeeded in stealing the souls. Sans used her soul to send Frisk through the barrier, and she helped protect and fuel Frisk for the rest of her pitifully short life, until her soul finally shattered through sheer exhaustion.