Pantheon as a champion
The first question I want to ask is: do you think Pantheon is good for the game?
My answer to that would be no.
In my opinion champions like Pantheon makes League of Legends more and more unfun to play. Here is why. During the laning phase Pantheon dominates lane to the point of completely poking you out of lane or just turret diving you under tower. Pantheon however does fall off hard however I think that if you're up against a good Pantheon player "late game" does not happen. So to make Pantheon a better and more balanced champion I think the champion needs to be reworked. As of right now all Pantheon does is eventually poke you out of lane with Q.
So if a rework is not possible here are some changes that I think should be considered;
-Q mana cost should be increased a bit -Pantheon should not be able to block turret shots -Ult should be tweaked around a bit if not just reworked
I understand that if these changes do take place that Pantheon would be more then likely be never picked as he would be a pretty bad champion. That is why I truly think Pantheon needs to be reworked. The truth in my opinion is Pantheons kit is just simply bad for the game, whenever you lane against Pantheon you know its going to be a boring lane as you really have a few options. Wait for him to push you under tower and get a gank from your jungler. Let him poke you over and over again untill you are forced to leave lane or be dived. Try to outlast him till Mid-Late game. Or just try and all in him. (which you probably will not win)
I am aware that Pantheon has a negative winnrate, a small playerbase, and he doesn't get picked in high elo that much. But the his play style still makes the makes the game unfun from that start of laning phase. (Given Pantheon does not run it down)
However, this is just my opinion and you are welcome to disagree and express your thoughts about Pantheon.