1. Kit simplifications
The last few champion releases have just had absolutely confusing and over mechanical kits. Releasing a new champion with perhaps a balanced kit or a simpler kit will just seem so much better for the community. It makes picking up champions easier for both the new players and old players.
2. Fiddlesticks buff
While the new Fiddlesticks has been buffed heavily on the VFX side, the kit still seems to be fairly weak. His win rate has been on a new low with 45% WR in over a million games in the Jungle and is literally unplayable as support because he has a 43% WR. The inability to successfully kill enemies in melee range with Bountiful Harvest (W) and Reap (E) leaves Fiddlesticks susceptible to early game aggression from stronger junglers and it takes far too long for him to scale into a late-game, A few slight buffs will put him at the right position in the meta and will be more playable.
3. A group dodge system in Draft lobbies
Riot Games should introduce a feature where you can have a /ff kind of a thing during champ select where if 4 out of 5 summoners decide to dodge, you all dodge the game without any penalties. This feature helps greatly when you know a player has picked a troll champion and has been talking shit in champ select and is ready to troll. This feature especially helps now as Riot Games have been planning on making the dodge feature have more penalties.
4. Buffs to the lowest play rate champions
There are quite a handful of champions below the 2% play rate who are in a desperate need for buffs to be playable again and brought back to the meta. Champions such as Annie, Corki, Twitch, Viktor, Ivern are barely played anymore and having them slightly buffed will give more opportunities to players to bring back their favorite champions or pick up new champions.
5. A new troll skin series
League of Legends should release a new troll skill series just like how they released the Star Guardian URGOD. Perhaps a series that would define the champions such as Feeder Yasuo, No Skill Master Yi, etc. or a series that makes everyone in the player base happy just like how Star Guardian Urgot did.