Illaoi could do with some loving
I feel like Illaoi right now is a bit too weak, whilst she can be great in lane and in 1v2 scenarios she struggles in team fights. One big reason she struggles is that she just gets locked down so she can't do anything. I think it would be cool if Riot made some changes to help her out and recommend it interacting with her passive.
She is a devout follower to Nagakabouros so I feel like she should feel empowered when near tentacles, maybe make it so she gains some resistances when near them, or even tenacity. I just feel like this would be a good way to make her see more play, there is obvious counter play to this as they die easily, but when she summons all of Nagakabouros' power with her ult she feels like this warrior priestess who has a deep connection to her god, and makes it feel like her god loves her back so watches her back for a little bit.