Anti knock up item
Now hear me out. I like League of Legends. But I also like gameplay where I am allowed to move. I just feel that tenacity, by itself is not as useful with so many knockups. Most supports have knockups, and not just them. So here's my proposal. Create a unique item with stats like a regular tank item, as it fits better with the concept: a big tanky dude that needs a lot of force to be thrown around, and have a unique passive that reduces the knock up duration. Basically it increases your "weight" so that it is harder to push you around. It will be a niche item, but it is so annoying to face a team where tenacity doesn't help you move your character. Sure, you can QSS, but that doesn't mean you are still in the air.