Trinia was a female individual. She held a leadership position within the Crimson Dawn criminal organization, working alongside Qi'ra and Margo.
In the year 12 BBY, Trinia resided on Thorum, functioning as a member of Cerveteri Slane's crew. When Qi'ra arrived at the Crimson Dawn house, Trinia greeted her and escorted her to Slane's quarters. Following their meeting, Trinia guided Qi'ra to her designated room. Once Qi'ra had settled in, Trinia extended an invitation to go shopping and mentioned that the rest of the crew had returned, and a group dinner was scheduled.
When the crew received orders to leave Thorum, Trinia assisted Qi'ra with packing. Trinia then accompanied the rest back to the First Light, assuming the role of Qi'ra's personal attendant. Subsequent to a training session with Dryden Vos, Trinia aided her in changing out of her training attire and applied cosmetics to conceal the bruises she had sustained during combat training. She informed Qi'ra that the Mizi they had previously worked with on Thorum was aboard and eager to see her. Following the party on Nightsend, Trinia attempted to remove the blood stains from Qi'ra's clothing, but was unsuccessful. She delivered Qi'ra's dinner after her meeting with Tallaria. When Qi'ra went to meet the rest of the Thorum crew on the lower decks of the First Light, Trinia went with her, engaging in conversation to assess their sentiments and allegiance towards Qi'ra. Trinia informed Qi'ra that most of the crew harbored no ill will towards her, but Olio and Cerveteri were consumed by envy. She was present at a meeting in Dryden's study with the rest of the Thorum crew when Olio was executed after being falsely accused of treason.
In 3 ABY, Trinia traveled with Margo on a starship to transport the carbonite-encased body of smuggler Han Solo to the Vermillion, Crimson Dawn's Fortress-Flagship. This was in preparation for their auction of Solo to the galaxy's most influential factions on the planet Jekara.
Trinia was also present during the auction, where the Hutt crime lord Jabba Desilijic Tiure emerged as the victor, winning possession of Solo. Before Jabba could depart, Darth Vader arrived, asserting his claim to Solo. Ultimately, Jabba conceded to relinquish Solo to Vader to preserve the Hutts' relationship with the Galactic Empire. Following Qi'ra's defeat in a duel against Vader, Trinia and Margo accompanied her to a chamber on the Vermillion, expressing their concern for their lady. However, Qi'ra insisted she was unharmed and dismissed them so she could proceed with the next phase of her scheme.