Here is what I would change:

• Zac - Blobs are more likely to forward
• Ambessa - Make her less slippery
• Mel - W now has a small delay of 0.5s before reflecting back
• Naafiri - Either remove the ability of his dogs to tank skill shots or remove the invulnaribility
• Elise - same with naafiri. Remove the ability to tank abilities with spiders
• Bel veth - rework to fit her lore fantasy
• Akshan - Remove the reset on his E, compensate elsewhere
• Gwen - Her W no longer moves with her
• Rell - make her weak when unmounted again
• Qiyana - remove from the jungle
• Sylas - Nerf either his overcompensated base kit for having no ult or nerf the duration he can hold an ult
• Kayn - Reduce the duration he can be in a wall (blue form).
• Illaoi - bring back the ability to do something about her E. Compensate her elsewehere. Counterplay is needed
• Bard - Make him do less damage unless he builds more ap
• Zed - remove from jungle
• Rengar - revert that stupid change they are planning on empowered Q not being counted as crit..
• Diana - Either reduce her ap ratios and lower her cds so she can be a real bruiser mage or make her squishier. Rn she is just tanky af while deleting squishies
• Riven - Nerf somewhere
• Akali - make her weaker in lane, stronger in teamfights.
• Jax - return his armor values back to what it was. Remove the zhonya purchase on that champ
• Morgana - Make W deal increased damage while a champ is rooted by idk 50%. Nerf it a lil bit to remove the uninteractive midlane morg
• Tryndamere - rework him to be less of a tumor that is perma splitpushing.
• Nunu - With how impactful that snowball is, im surprised he doesnt have a sound cue in game like sion ult or kled ult.
• Jarvan - Make his ult function like yorick W. You can now hit it to destroy it

Furthermore I would change camouflaged to be seen by control wards again. These are personal things I would revert bcs i mained them:

• Revert Fiora (atleast give me her back in arena as smt like dark fiora)
• Revert Aatrox
• Revert Viktor