Broken Champions (YOU KNOW WHO I'M TALKING ABOUT)

There needs to be some form of nerf for the following champions:

-Ekko -Diana -Katarina -Kalista Many more...

I will cover these one by one, and go over their abilities and such to only further my point on why they should just be removed from the game.

Ekko: This little monstrosity was recently introduced into the League. Upon release, he was just broken. Like no. That was a big mistake on Riot's part. He not only gets a massive game changer, which is also a juke, repositions him, and opens up your team for damage, but can also DESTROY people, almost instantly. Don't give me "Oh he's an assassin, he's supposed to be that strong," or "He is squishy, that makes up for his high damage." NO. His concept is cool and all, but his stats are NO. Just actually nerf him this time, unlike the 5.12 'nerf' and make his ult only return HALF OF THE HEALTH HE REGAINS. That thing is evil, and you can't kill it unless you lock him down.

Diana: Do I even have to explain? Diana is the easiest champion to fight against. You can just demolish her in lane. You could have her shut down, 0/20. Once she gets that one kill... that ONE, DAMN KILL, YOU HAVE SET OFF A TIME BOMB, THAT BLOWS UP AS IT ARMS ITSELF, AND JUST GETS STRONGER. That one kill lets her snowball SO HARD, it's not even funny. She can just go and snag your support, kill them, whatever. THEN COMES BACK AND EATS YOUR TEAM. Her whole kit is stupid. The fact that marking enemies allows you to use your ult AGAIN, and AGAIN, is just broken. The worst part is, she has AoE damage. If it was single target damage, then it wouldn't be as bad. Just, no. Do something about that... that thing.

Katarina: Ok. So Kat. The "Feed me and there goes your mid and late game." The tier 1 snowballer. Sure, her ult can be interrupted, but her passive can't. She is the definition of short-term, AND long-term snowballing. Kills and assists lower her cooldowns. What does that do? It lets her do MORE DAMAGE, MORE FREQUENTLY, and just get MORE KILLS, LEADING TO MORE ITEMS. Now, I know that if you don't get fed as Katarina, you don't become a spamming piece of teleporting crap. But when you do, might as well have a second surrender button labeled 'Kat's fed', and just ends the game immediately.

Kalista: I have no problem with Kalista. She is broken to all hell, with that passive, and her E, and her escape/engage ultimate, but is not a problem for me. I just don't want to hear people complaining that they want her nerfed because they left themselves open for free damage. In my opinion, she is too strong, kit wise. She gets a killswitch E, which if he she auto attacks you enough, you will literally die instantly. She also has a dodge/gap closer ON HER AUTO ATTACKS. Get rid of that Q or E, and make her passive an active skill that lasts 10 seconds that lets her jump in between autos.

Just let me know who you think really needs a whip on the arse with a few nerfs.