When Nomura created Stella back in 2007, he actually created something that was not his type of character, but overtime he grew fond of her. Tetsuya Nomura has commented there being no specific reason he redesigned her look, other than wanting to make her prettier.
Stella's appearance underwent changes since she was first unveiled. Gentiana's original role for Final Fantasy Versus XIII was that of Stella's messenger, and a contact point between the countries of Tenebrae and Niflheim. She was shown to reluctantly fight Noctis in an early trailer, wielding powers similar to his to forge weapons from thin air. After a near-death experience early in her life, similar to Noctis, Stella could see the light from the Kingdom of the Dead, which granted her special powers. Stella was a member of the wealthy Fleuret family and resided in the land of Tenebrae. Stella would have met Noctis at the signing ceremony between Lucis and Niflheim, where a great deal of their connection would have been revealed. Like Noctis, Stella could materialize weapons from thin air, as she summoned her rapier from a rune similar to one used by Noctis to summon his sword, though Stella's rune was golden while Noctis's was blue. According to character designer and director for Final Fantasy Versus XIII Tetsuya Nomura, Stella would "stand out" in some way from the other female characters in the series. As demonstrated in the Tokyo Game Show footage, she was direct and did not shy away from her problems, as opposed to Noctis, who is more reserved. She had an honest and polite attitude, but was assertive and true to her beliefs due to her upbringing. Her party outfit consisted of a white sleeveless top and a long skirt, complimented with white shoes. Her regular outfit consisted of black top, skirt, and belt, and a white sleeveless bolero.
Stella had long blond hair with side-swept bangs, round pale blue eyes with purple aspects around the iris (which, at one point in development, became purple irises outright) and wore small silver star earrings. But after the release of Final Fantasy Type-0 HD and Final Fantasy XV Episode Duscae you can expect some new and interesting information about the story." On June 4th 2015 it was publicized Stella would not appear in Final Fantasy XV. When asked about Stella, director Hajime Tabata has replied: "Sorry, I can't (laughs). There was no new information on Stella since the game was rebranded Final Fantasy XV. This way, they could also focus on creating a character that's their own. Rather than disappoint users by including a Stella that didn't match what they expected from the early reveal trailers, the developers went with a different character altogether. Her design was reworked into the character Lunafreya Nox Fleuret, who serves a different role in the story than was planned for Stella. Stella Nox Fleuret ( ステラ・ノックス・フルーレ, Sutera Nokkusu Furūre ?) was a character that appeared in promotional material for Final Fantasy Versus XIII before it was reworked into Final Fantasy XV.