Toriel

Toriel is an old monster who lived in Mount Ebott. She only appeared in The Room of Undertale, and was killed by the Locked Room Gang near the beginning. She was roleplayed by.

Pre-IaLR
During the monsters' entrapment in Mount Ebott, she was married to Asgore Dreemurr, and had a son named Asriel Dreemurr and adopted daughter named Chara. However, one day, Chara poisoned herself with buttercup flowers in a plan to break the mountain's barrier. After her death, Asriel took her SOUL and brought her to the overworld to bury her, but the humans mistook it for Asriel killing her and brutally attacked him. He returned to Toriel, but died shortly afterwards. After receiving the news, Asgore declared his plan to get seven human SOULs and destroy humanity. Toriel was outraged at him, leaving him and remaining in the ruins section of the mountain, secluding herself from the rest of the underground.

Many humans fell into the ruins from the top of the mountain, and no matter how much she tried to save them from Asgore, she failed every time.

The Room of Undertale
Toriel's first and only appearance was in The Room of Undertale. When the Locked Room Gang entered the room into Mount Ebott, she saved them from Flowey the Flower. She then proceeded to guide them through the first few puzzles of the ruins, before giving them cell phones and leaving them to complete the rest of the puzzles.

Later, the gang reached her house, she introduced them to her house and gave them Butterscotch pie. After the gang had a rest, they asked her for permission to leave the ruins. She brought them to the exit, but warned them about Asgore. She then started to battle them in a test of strength. After all of the gang (Except for Lucas) attacked her, she succumbed to her wounds, and turned to dust after declaring they passed her test.

While she was never revived, Sonic the Hedgehog mentioning her played a role in bringing Asriel Dreemurr to his senses in The Lair of the Dark Star.