Tristão serves as one of King Arthur's Knights of the Round Table in the series' first phase. He battles enemies like King Levik and Morgana Le Fay, defending Camelot alongside core knights Lancelot, Percival, Kay, and Hector while upholding the Round Table's ideals.

His presence becomes intermittent during the second phase, occasionally rejoining Arthur's efforts to protect the realm. Arthur's focus in this phase shifts to combating the Viking King while traveling incognito.

No specific backstory or personal development for Tristão is detailed within the provided sources, nor is his involvement in other media like movies, OVAs, or spin-offs explored. His portrayal consistently shows a loyal knight supporting Arthur's reign across both phases.