Ruby is one of the playable characters in Crossover X. She comes from the now-extinct Leaf Fox species, and hails from Oria. She has golden fur and a leaflike tail, and is never seen without her cyan bow. She is more speed-oriented than the other playable characters, as she has high speed, average defense, and fairly low attack. She is set as the second player in Multiplayer by default, but like Corona, any player can play as her. Color swaps are available.
Like X, Ruby is locked in single-player at first. She is, however, the easiest to unlock. All you have to do is find her hidden in the first Ghiria level (she's up a tree). Once you find the right tree in the level, an "A" button icon will appear above your character. Press A and Ruby will come down. After this she will talk for a bit and then run off. She is playable from there out.