So I just downloaded the game today and going through the characters, I really wanted to roll Luna. Can I reroll for her or is she limited?
She was limited, so currently not summonable. Luna’s banner (which was in February) may return after a year or so though, so you can reroll for her then or start now and save up ~6000 Skystones for the guaranteed summon.
We haven’t had any Limited banners rerun yet, but since Luna’s Side Story was never on Global, I think it’s quite likely we’ll eventually see a rerun banner so EN players can pay that event.