Remove Koggy's range steroid
Now before you grab the pitch-forks hear me out.
When Koggy was originally added to the game he had 750 attack range when his W was active. Back in the day, that was plenty of buffer between himself and folks who wanted to kill him. He was able to dance around outside the range of various targeted gap closers and generally do his job. But now in the League of Mobility 710 range just isn't cutting it. And now that Jinx boasts similar range (with a much stronger lane phase, 100% range uptime, greater utility, and similar damage provided she's hitting at least two targets with Fishbones) it's really leaving poor Koggy without a leg to stand on. His niche of long-range auto-attacker is getting trampled all over by Trist (if you want more safety) and Jinx (if you want more damage).
Right now, Koggy's identity could be summed up as 'Immobile tank-busting artillery platform that's also a long-range machine gun sometimes'. I'm suggesting we tighten that up to 'Immobile tank-busting artillery platform'.
So here's what we do.
Koggy's base attack range is increased to 550. His W %HP damage becomes passive. His W active enhances his next auto-attack with a huge range buff, allowing him to lob a single auto-attack waaaaaay over there. Y'know. Like an artillery platform. This would pretty much without question require his W to get a mana cost again. Free long-range harass is bad (lookin' at you,
).
Because Koggy would no longer be able to burn people down with intense DPS from 710 range (the aspect of him that tends to get abused in super-organized high-level games) he could safely be buffed for us mere mortals. Who knows, this might even open up enough kit power to give him a passive that actually fits with his kit! From here Riot would be able to either improve his artillery potency or his ability to duel folks who try jumping on him.
tl;dr: remove the least interactive part of Koggy's kit, freeing up a TON of kit power. Make him THE artillery champion.