I want a sentai skinline to counter the Star Guardian's Magical Girl skinline, goofy jumpsuit outfits and all. Not sure if Super Galaxy is supposed to be that, but if it is, then the skin line is/was rather poorly done if we're just going by champion choices alone (Shyvana and Kindred? Really?)
That or they could take Popstar Ahri and expand it into a Kpop/Jpop/Hatsune Miku kinda thing. But I can't see them coming up with many other skin line ideas based off anime genres alone. Maybe if they made another mecha skinline that's less Pacific Rim & Transformers inspired and takes more notes from say, Gundam, like Lancer Zero Hecarim.