And just flying up to cross a river/ravine is also cool. Of course, you can do that with own grandpa's pillar/Albedo's lift, but it's not as convenient. Plus, Kazuha can press his E in flight on cooldown.
But I forgot about the mujina) If you just need to run more or less far somewhere, then she is the coolest, yeah.
Added after 8 minutes
Pulling for Ayaka ahead of the banner. I'd love to get C2, but I can only scrape together enough for C1, which isn't really needed. Better to try for the sword on luck—especially since it's OP for Keqing too.

To sell my soul

