Agate was in Void. She happily watched Bête Noire wreak havoc. She especially liked to see the tears of others, even children. Monsters and Chara/Frisk were especially included in this list. She literally has no regrets.

When she sees you in the dark void, she just grins a little crazily, and speaks in her sweetly tender voice.

Agate: "Oh? And then they found me. Any questions? Do they want to ask me about me? You know, I don't mind! I'm even in favor! Read the questions of these weaklings. I will be happy to answer."