Lulu's base model needs an update
Lulu's model is easily the ugliest still in the game. Rammus' might be in more need of an update but his model feels just a bit more timeless than whatever Lulu's face is meant to be.
Her gameplay is good, nothing needs to change about that. Her design is fine, her animations are fine, particles are fine, even pix is fine. But the base model (and old skins) really needs an update. The older splash arts could be revisited too but that's not as urgent as the model.
Bring her base model in line with Poppy, Tristana, and with her newer skins.

who all have much worse base models than Lulu]