My take on Fina for my Skies of Arcadia redesign.
Fina surprisingly gave me a lot more trouble than either Vyse or Aika did. I ended up keeping the dress-type outfit she had in the original game, as it makes her look more out of place on the sea in contrast to Vyse and Aika. Additionally, I made Fina's hair straight and orderly to contrast with Aika's to represent their differing personalities. I wanted Fina to read as someone who's more serious and slightly more introverted.
Because Aika already had a flying bird as a weapon, I had to change Cupil so there weren't two flying animals as weapons. Instead, I gave Fina a staff with some kind of exotic Silvite crystal that I imagine is able to change shape just like Cupil can. So as you upgrade Fina's staff, the crystal is able to change shape into other types of weapons such as an axe, spear, halberd, hammer, etc.
You can check out sketches and design work on my blog at yagaminoue.tumblr.com/