The phrase "although fictional" is correct and usable in written English.
It can be used to introduce a contrast or qualification regarding the fictional nature of a subject or narrative.
Example: "The story, although fictional, offers valuable insights into human nature."
Alternatives: "despite being imaginary" or "even though it's not real".
The new movie, although fictional, feels as real as their earlier films.
Although fictional, it is based on a true account of a woman who is awaiting execution in a Cairo prison.
Although fictional, Woman at Point Zero is based on a true account of a woman awaiting execution in a Cairo prison.
Although fictional, the marshmallow caricatures in Pixar's WALL-E resonated with many viewers because they recognised the possibility of such laziness in themselves and in the technologies they use.
Although fictional and entirely scripted (though nearly plotless), the show pretends to be one of the docusoaps popular on British television, like "The Cruise" or "Driving School," complete with swerving camera moves and talking-heads segments.
Although fictional, the screenplay by Guerra and Jacques Toulemonde draws on the journals of two real-life explorers: German ethnobotanist Theodor Koch-Grünberg and American botanist Richard Evans Schultes.
Although a fictional site, its clear brand identity, user-friendliness and clear messaging ensured it hit the spot.
Although the fictional detective had been anticipated by Edgar Allan Poe's C. Auguste Dupin and Émile Gaboriau's Monsieur Lecoq, Holmes made a singular impact upon the popular imagination and has been the most enduring character of detective fiction.
Although a fictional character, she tells the narrative of many women of color.
The popular French comics series Michel Vaillant by Jean Graton is set in the world of motor racing and, although largely fictional, often includes real-life figures including drivers, officials and journalists.
Although the fictional parts are arranged to be dramatic — a pioneer story, full of obstacles — the staged scenes on Mars and on Earth are oddly plodding and ponderous, pious and platitudinous.
