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Stella Loussier is one of the three Extended pilots from Phantom Pain under the command of Neo Roanoke. Together with her comrades Sting Oakley and Auel Neider she infiltrates the PLANT colony Armory One and, with the help of some ZAFT-soldiers, they steal three new Gundam-type mobile suits. Stella pilots the ZGMF-X88S Gaia when fighting. While Stella is normally calm, whenever she hears the word "die" or anything related, she grows berserker, afraid of dying. When she suffes from this trauma, Shinn Asuka, unaware of her identity, calms her promising to protect her. Stella befriends Shinn who discovers her identity when taking down the Gaia. 

Source from Wikipeida