I am super confused about this character, I've seen her appear in several different series, Shadowverse as a card, this person has her as being in Grandblue fantasy? and lastly she seems to be a character from this Shingeki no Bahamut series? How can she be in so many different series?

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Selvokaz said:

Cygames developed all three of the games you mentioned, so basically Grea is just reused from one series to another.

I see, thanks for the clarification.