What abilities would you rework?

There are quite a few abilities in the game that have basic and understandable concepts, for example, grenades. Viscous, Paradox, Ivy, Kelvin, Trapper have their own grenades. And among them, I would remake kudzu bombs, purely in my opinion Ivy as a character is not so much made for grenades, because her whole spirit gameplay boils down to spamming bombs alone (Although with the latest patch her Watcher's Covenant has become very strong), while other characters have more flexibility. Especially after Trapper arrived. He's making so much sense with these puddles, which is basically kudzu bombs+1 but much more fitting to character.

What abilities do you think a particular character needs to change?