So, considering the lore of of the game...

Who would you like to see become a champion in the future? Any figure from the lore of any champion or from past events of the League, pre-Summoners or post-Summoners is valid. And for that particular champion, why would you want them in particular and what could they offer, both lore-wise for the game as well as what they could offer in the game, depending on how you might have them introduced? I feel that lore is a good part of the League, and we enjoy a lot of new and fresh faces just as much as we like the expansion of inherent storylines and plots revolving around the champions themselves.

An example with Illaoi, her introduction raises so many questions: how did she enter a relationship with Gangplank, what influence might her god have on the events shaping Runeterra, what does her taunt towards Aatrox suggest about himself and the Darkin?

Things like this get me excited and the upcoming Mt. Targon story just makes me anticipate more additions to the league and expanding on everything.