Can’t draw on cpu yet so here’s a brief lowdown
Chara doesn’t hate humanity nor do they love it, they knew what humans did wrong yet they knew there’s hope for monsters living comfortably on the surface.
During this time Asgore hasn’t become completely deranged with hatred, but chara was still hidden from him.
Toriel and Asriel were the main ones who took care of chara, hoping that they could convince Asgore not all humans are hateful, and then introduce chara to him.
Toriel never doubted charas hopeful intent, Asriel would be very wary of chara at first. He wouldn’t be mean but he would at first be very distant until he saw how helpful chara was with Toriel. Still he would come off as rude and defensive in the beginning, but chara would understand where it’s coming from.
At some point Asgore would come across chara before they set out the plan to convince him about humans. At first Asgore seemed somewhat welcoming to chara which threw both Asriel and Toriel off, but Soon afterwards Asgore would have poisoned chara. Chara fell ill and spoke about wanting to see the golden flowers in their village.
Asriel does the thing and the humans off him.
Toriel finds that Asgore was responsible for poisoning chara, she immediately detaches and goes into hiding, Asgore blames chara for meddling and ruining his family. Then he becomes the most hateful monster in the underground.
OK THATS ALL I CAN TYPE SO FAR, but that’s ... the jist..