I'm all for puppet characters. Puppet characters are cool.
I think the first ability needs more utility. Converting creeps won't do very much because the enemy will just shoot it down. It'd be kind of a waste. Maybe at least boost its health and damage, perhaps.
I like his 2nd and 3rd ability.
But I find the ulti........odd. Not bad. Odd. It's not an ultimate ability I'd expect from a puppet character.
With that being said, I feel like you'd need much more reliable cc if you want to kill anyone with that ult. Draining life isn't that big of a deal if they can just run away from you. I get you're supposed to hook them in with Father and/or the 30% slow on the ultimate 1ap. But I still feel you need a bit more, maybe a stun with the Catch & Fetch? idk