@TacoRey You can make Chara a Yandere and add Betty Noire yo the story as a rival to Chara and fight for the love for the reader and then make the reader have the choice of being with the both because he can't make Chara and Betty sad or hurt themselves by fighting constantly.
And /Or add more charas from diferente Au's that fell in love with the reader and the Charas having a discussion and a cute fight for the love of the reader, i personaly would love seen underswap chata being the shy, pacifist and cute of the group, of course the all Chara's will be yandere or protective towards the reader.
It will be fun to see that, and I would really appreciate it if you would consider any of my ideas.
And if not, don't worry, they are just ideas, I love your story, please don't abandon it