A Small Garen Buff
Target his ult and make it easer to get off.
I don't play Garen much anymore, and today while playing with my brother, whom was playing Garen he couldn't ult the enemy Vayne because he invisibility would cancel his ult. By this I mean he would be mid animation, Vayne would go invisible and it would cancel.
I've had problems with Garens ult in the past and I think if it was made so that Garens ult was easier to get off, a la Invisibility not canceling or other things, I think it would be a nice Quality of Life buff for Garen.