So... You'd like me to add Asriel's personality to the personality section?

I'm not necessarily confused, just uncertain about what you really want here. If the information you want is in the background, then what issue do we have? I don't mean to come off as rude, but I can't think of much else to add to Flowey's personality otherwise. He's an empty being that's been driven insane by apathy and guilt. There's not much more to it.