Odd that neither of the announced games include Narmaya. I'm not into Granblue myself, but Narmaya is definitely has a big fanbase up there with the main characters. For instance, I think it's only her and Vira that have multiple scale figures out of the whole cast.
Oh yeah, Narmaya is pretty popular, though I don't know anything about her personally. She may very well be announced later. They won't reveal all the characters immediately.