The worst kaw player? The ones that refuse to help people with simple question, that continuously tear down newer players. You can't name a "worst" player when you haven't talked to all players. I'd say that if you are just a troll, and troll threads of those people that need help, you're the worst player.
I'd have to say melissa_honeybee or however her name was spelt, her constant threads coming out with bs about iG was so annoying.