The phrase "as fictional characters" is correct and usable in written English.
It can be used when discussing or describing individuals or entities that are not real but are created for storytelling purposes, such as in books, movies, or plays.
Example: "The actors portrayed their roles convincingly, bringing the story to life as fictional characters."
Alternatives: "in the realm of fiction" or "as characters in a story".
Being a fictional character may seem to be the prototypical candidate of an extranuclear property, as the case of (5) above testifies, but there may well be 'metafictional' narratives whose protagonists are not characterized in the usual way as flesh and blood individuals, but instead as fictional characters.
But as fictional characters, both Bobo and Fergus ring true.
When did you start thinking about these brothers as fictional characters?
It's easy, even in the couple's presence, to think of them as fictional characters.
When characters in historical novels die, they die as fictional characters, not as historical personages.
Grafton was so "authentic" that it became indistinguishable from a fake town, its townspeople so "real" that they could be cast as fictional characters.
Whether the stroller appears as fictional character, literary persona, or the nameless, omnipresent narrator of panoramic fiction, he casts the woman of the streets in a distinctive role.
Mellqvists Kaffebar was Larsson's fika joint in real life and it also served as fictional character Mikael Blomkvist's regular coffee spot.
"I'm good enough, I'm smart enough, and doggone it, people like me!" - Al Franken (as fictional character Stuart Smalley), Minnesota Senator.
Architectural subjects and scale are common, as are fictional characters, who appear in videos, beset with crazed melancholy.
Last year, a study proved that reading novels triggered neural changes "associated with physical sensation and movement systems," making readers feel as though they're actually experiencing the same ups and downs as the fictional characters.
