I really love this game mode but it is still missing Riven, Quinn and Kayn!
For Riven, she was already in during her skin promo last year, but I don't see why she was taken out. There are a lot of top-laners that made it in (Pantheon, Camille, Yasuo, etc) and I think Riven belongs in the roster.
Quinn synergizes well with lethality and is fun to play as an assassin so she fits in the roster very well.
As for Kayn, I understand it may take a bit more work due to his kit, but please at least give some love to Riven/Quinn and include them in the roster so there are more options to make this game more fun!