Chara are a subspecies of humans known to produce abnormal amounts of Determination. Unlike the Frisk, the Chara is driven to murder everything, maybe even itself if you give it enough buttercups. They murmur about nonsense like Resets and Lv. We all know it means level. An extreme hatred for humanity is what drives it to this genocidal behavior. They are powerless, however, to the sickeningly merciful Frisks and Jays.