If the Star Guardian event returns in the future, please use something similar to Augments
The augments you can take on in Odyssey mode really allow for some interesting improvements that are like Talents in HotS, and having something that's the same in all but name for a Star Guardian event could really help make the mode more fun. For instance, SG Ahri was never really that good in the event since her damage was on the weak side compared to Jinx or Ezreal, so giving her some "talents" that improve her during the event would greatly improve the mode.
Besides just gameplay improvements, we'd also get to make jokes about how Miss Fortune has the most "talent". [sg-ahri-2] https://youtu.be/u-h3cgyNnAU