Board Thread:General Discussion/@comment-27997069-20160317174518/@comment-27620479-20160331054749

Frisk and Chara are the part where information is left to the player's imagination. They don't create plot holes, what is revealed about them is still enough for a consistent story.

In fact, there are more details than needed. We get to know that Chara hated humankind, and that gave way to a persistent opinion of them being evil(ish), or sociopath(ic).