Things riot needs to fix for next year

High priority:

• Jax e (Dodging all auto attacks is too strong of an ability)
• Fiora w (Shouldn't slow attack speed)
• Kai sa (Her entire kit is too strong, it's not just a number issue)
• Tryndamere passive (Too much rng)
• Malphite (Too much base damage)

Medium priority:

• Veigar passive (Too easy to stack, gives too much)
• Ezreal (Kit is too overloaded, he can build frozen gauntlet + tabis and not suffer much damage wise)
• Yasuo (Has too much unnecessary stuff in his kit) (Remove crit passive, armor pen on ult, q scaling with attack speed, and/or shield passive)
• Caitlyn w (Too strong of an ability when paired with her passive)
• Malzahar passive (Not fun to have, not fun to play against)
• Riven passive (Gives her too much damage for how much her kit has)

Low priority:

• Fizz (His kit has too much base damage)
• Nautilus (Too much damage for how much cc he has and how tanky he is)
• Gangplank Q (One of the most annoying things in top lane when he can use it with grasp and klepto on such a low cooldown)
• Diana (Her burst is way too fast for how much damage she deals) (She is pretty much a walking 50 minute veigar ult on a 6 second cooldown)
• Kled (His kit is not fun to verse in lane)
• Akali (Her kit is just toxic, same as kled)
• Zyra (Her kit has too much in it so she is forced to have low base damage)
• Rengar w (The healing is too much and makes him very tanky for being an assassin)
• Ahri ult (Gives her too much mobility)
• Brand passive (Should not do max health damage)
• Camille ult (Needs more counterplay)
• Kindred ult (In the right hands, very annoying to play against. In the wrong hands, very annoying to play with)

Misc:

• Fix tenacity so it isn't garbage (cc is too strong)
• Bring back spell vamp (the excuse for them to remove it wasn't valid and now more than ever isn't valid)
• More attack speed items that aren't just crit
• Fix magic resist
• Stop just throwing health and mana onto ability power items and actually think of more interesting things (same applies for cdr on ad items)
• More variety in boots (It's the same thing for every character, assassins take mobies, mages take sorc shoes, tanks take tabis or mercs)
• Boots of swiftness (They aren't that much faster than normal boots, only giving +10 movement speed and very minimal slow resistance)
• Ionian boots of Lucidity (There is way too much cooldown reduction in the game right now, mages don't take it because sorc shoes are just 10x better)
• Bring back all the niche items (Sword of the ocult, Deathfire grasp, Will of the ancients, Zephyr, Banner of command, Force of nature, etc...) (if some were a little too strong, just fix their stats)
• Bring back and introduce more economy items (Heart of gold, Avarice blade, etc...)

These were the ones off my head and doesn't include anything gameplay wise like plants, dragon rng, baron enhanced minions being too strong, etc...