>>67377741There's definitely an opportunity to make something of her kit ideas--songs as a mini-rhythm-game for buffing/debuffing (maybe like hunting horn?), her sound-controlled spirit hands and koto picks for special attacks--but the issue is that most of the other Eternals fit more naturally into either game because they are martials.
Though personally I think mixing up non-martials is more interesting than adding the umpteenth sword/spear user, because unusual weapons result in creative kits that can have a lot of fun potential. It seems like the game devs don't feel the same way. They want to just add popular characters and dev favorites, and I've never felt like Nio was the latter, though she has her fans.