We are an amalgamate, meaning we are two monsters and a human fused together.
Dracco’s tongue has melted slightly so his speech is slurred slightly, Serif, never had a tongue in the first place, so he’s good. Serif also got all the iq, apparently, so dracco is dumb but friendly, like a giant puppy, though don’t anger him, he is strong. 
Chara is the tactics of the trio, and helps them remember resets, boost magic, and drives their love of chocolate. 
They are a part of the “bad sanses”