Stella, or "Princess Stella Organa," (born 19 BBY on Polis Massa; died 35 ABY on Ajan Kloss) was both a main and playable character in the Star Wars game. Stella was introduced from the very start of the game in promotional art and even had her character introduction set, but was not introduced as a playable character upon the game's release. In fact, players had to wait until the Hoth update to play as Stella in levels.
In the storyline of Star Wars, Stella plays the role of Princess Leia, Luke Skywalker's sister and Han Solo's love interest. She is first held captive by Darth Vader until she is saved by the others; from then on, she becomes a very prominent character in the storyline.
Strangely, some artwork and animations of her have a tail showing on her back, but it does not appear when you play her in the game. The tail also fails to appear in her plush toy.