A thought: Make Katarina need to stay inside a tether range for her Shunpo to detonate
I hate how Katarina can just dump on you, then blink away and stroll back to base. I'd love to see her need to commit fully for the kill by staying inside a very close range in order to detonate it instead of just pulling a Fire and Forget by dumping her full kit out then running away.
Something something Risk/Reward.
Because Katarina is real skill champ with serious mechonics.