"ballerina" is a character costume in StrikeForce Kitty.
The fox wearing the "ballerina" costume can be found in level one with "lun chi" in the middle of the level. Wearing the set requires defeating the fox multiple times until all three pieces are obtained, or by chests.
The costume set contains three pieces: cap, dress, and main-hand wand. "ballerina" does ranged damage and has the special ability to attract fish at distance level one.