The 1 thing I can tell Shadow Kayn needs a buff on and it's a must....

His Q should be like his W but a little longer range and the shadow from W since trust me I hate this I have a habit of using W then Q to close the gap to then ult but keep on forgetting his Q doesn't allow him to follow up with a ult instantly and because of that he can get burst REALLY REALLY fast for a assassin jungler when you try to get on target. Some times enemy can even get away when you try to Q because of the animation time which roots you until it's over.