Phoenix is the Valkyrja form for Fu Hua as she dons a chinese-themed dress with a red and white motif which also changes her hair colour from the original deep blue to a silver base with redstreaks and gradient red tips.
Her other outfits include:
Sword and Fire: Black and red Medieval-style chestplate and leggings.
Fire and Sword: Like Sword and Fire, but white instead of black, as well as her original grey hair and blue eyes.