Predator

I think it is OK. But I can imagine a few ways to modify it.

Target has to be hit after they fall to execute threshold. None of this taking a hit from 100% to execute range and dying outright.

Or/and

Item chip damage cannot trigger it, must be an attack or spell hitting the target.

Or

Just make the execute range 5% lower.

Or (my favourite) change the functionality. My suggestion would be to have it so if they deal 90% of a targets HP their target is killed. A counter to healing comps if you fail to get the burn items.

? Who exectly is it overpowered on? Last time I checked its not even META for Hecarim.

Predator definitely needs some kind of nerf. I think Kog'Maw is a MAJOR abuse case for it, and given that Rek'Sai and WW can get so tanky that you can't really kill them before you hit the execute threshold, I think it's just a recipe for broken. The threshold either needs to drop to like 10%, or there needs to be some other requirements to trigger it.

I believe the only nerf they need is to disable the interaction between items and their trait. Being executed from bouncing damage of the Statikk Shiv is really bad.