The phrase "as a fully formed" is correct and usable in written English.
It can be used when describing something that is complete or developed in its entirety.
Example: "The concept was presented as a fully formed idea, ready for implementation."
Alternatives: "as a complete entity" or "as a developed concept".
By avoiding conventional exposure, the Weeknd presented himself as a fully formed rock star from the outset.
Where they come across as one-note preachers or pedantic classroom teachers, he appears as a fully formed individual.
"Genius," which mostly covers Christian's time spent as a member of Benny Goodman's bands, makes clear that he arrived as a fully formed artist.
There are glowing tributes to her father as a photojournalist and as a parent, but he never comes to life as a fully formed character.
Most impressively, Rose seems to have skipped the amateur experimentation stage to emerge as a fully formed artist with her own distinct voice.
At a time when a hugely talented child needed careful guidance, he was being encouraged to think of himself as a fully formed musician.
Each outfit showed the talent of the designer to build intricate ensembles with beautiful detail work but, as a whole, the show just didn't crystallize as a collection with a fully formed premise.
At Sundance Feature Film Program, Michael Caton-Jones served as Anderson's mentor; he saw Anderson as someone with "talent and a fully formed creative voice but not much hands-on experience" and gave him some hard and practical lessons.
When you look at Skate the World as a whole, you see a fully formed concept, not just beautifully photographed environments, with people riding skateboards in them.
When the first settlers arrived, they felt as if they were buying into a fully formed dream.
An early review from Movieline described the film as "more of a doodle than a fully formed idea, though not necessarily less enjoyable for it, since it was clearly intended to be an undisciplined, anything-goes kinda story".
