In G.I. Joe: Renegades, Flint is First Lieutenant Dashiell Faireborn. He is opposed to the Renegades and is actively assigned to arrest them. He uses Lady Jaye as his contact to capture the Renegades, but is unaware that she is actually supporting Duke against orders and against Flint. He is aware she's sympathetic to Duke, however, and believed this would make her more willing to bring him in safely.
In a flashback as seen in the two-part episode "Homecoming," Flint was a football player who led his team to victory with a play that ended up breaking Duke's leg. Flint was happy to rub this in until he realized how serious the damage had been and that this ruined Duke's chance to get a football scholarship to college. To help him out, Flint got him a job in the army. In a later encounter, after seeing Duke save another soldier's life, he pushed to get the man a medal. Despite his overbearing and arrogant manner, Flint in "Homecoming (Part II)" claims that he is Duke's friend and has only ever tried to help him.
While Flint is an antagonist, he's still shown to be one of the good guys: Flint launched a raid on a corrupt prison; distrust of and distaste for Baroness' Cobra troopers. When the Renegades are briefly in custody, Flint interrogates Duke: he doesn't believe the truth about Cobra Industries but as he knows Duke is a good man, Flint believes he was coerced into destroying a Cobra factory on behalf of unknown backers who will now want to silence him. Because of this belief, Flint has the Renegades' families under armed protection so they can't be targeted. When the Baroness attacks the prison transport train, he reluctantly recruits the Joes to fight her off; when they escape afterwards, he deliberately doesn't shoot Duke when he has a clear shot.