Riot should release vague teasers and use community speculation to make a Champion.
I feel like a lot of the time, actual Champion Lore & Gameplay is quite underwhelming next to some of the hype and speculation that the community itself comes up with.
This was a more regular occurrence back in the day where it could be weeks between leaks/teasers and when the champion was actually revealed. People came up with some pretty big theories for Lucian, as an example, only for Riot to release his lore as him being a Vayne clone but with Shadow Isles Wraiths instead of Demons.
I feel like Riot could come up with a pretty cool champion if they released a bunch of vague teasers and concept art and let the community speculation flesh out the champion itself.