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The biggest one would be flying trainee Amelia, princess of Frelia. That would've changed a number of character dynamics substantially (and also made it so that you got two trainees early!) There's also Dancer Neimi, which looks absolutely fantastic - especially since the red color scheme works very well on her, and you can tell in the final product that she got kind of awkwardly palette-shifted late in development when Tethys' new design was finalized and she was repurposed as an archer.