- "The mighty WRO... they wouldn't last a day in Deepground."
- —Rosso the Crimson
Rosso the Crimson (朱のロッソ, Aka no Rosso?) is a member of the Tsviets and one of the antagonists of Dirge of Cerberus -Final Fantasy VII-. She is a sadist and her weapon is a unique double blade that is capable of gunfire, similar to a gunblade. She is voiced by Atsuko Tanaka in the Japanese version and Mary Elizabeth McGlynn in the English version, the latter of whom gave her a Romanian accent.
- "Slashed, strangled, and slaughtered. Beaten, stabbed, and crushed. Garroted and impaled. Shot and executed without mercy. Nicely said, Weiss. I wonder if this will be a little more amusing than last time."
Rosso was born into Deepground in 1985, making her 25 in Dirge of Cerberus. She was the first of the Deepground experiments to be spliced with Genesis Rhapsodos's genes. The success of her birth prompted further research and experimentation on Deepground troops. The rigorous training regiment of Deepground eventually shattered Rosso's psyche, leading to an obsession of bloodying her victims, hence her title "the Crimson".
During the events in the online Multiplayer mode of Dirge of Cerberus, Rosso explains she wanted to see the outside world's sky since she had only ever seen projections. She decided to kill countless Deepground soldiers in order to get her point across. Soon after, one of the Restrictors appears before her and challenges her. Though she puts up a good fight, she is defeated by the Restrictor. Later on, she is summoned by the Restrictor along with Azul in order to spar with Weiss.
She was defeated easily, but transforms into Bloodburst Rosso. Though she puts up a better fight the second time, she and Arch Azul are again defeated by Weiss. Soon after, with the Restrictor near death, the chips implanted in the Tsviets brain stems begins to wear off. Rosso and the other Tsviets laugh as the Restrictor breathes his last breath.
- "You know, this is the first time I've ever felt the rain on my skin. But then again, I hadn't even seen the sky until a few days ago."
- —Rosso to Vincent
While Vincent Valentine is in Edge, he finds a near dead WRO soldier who tells him of a woman in red who slew their troops in the warehouse and was gathering civilians. When Vincent arrives at the warehouse, Rosso is found to be more than a match for him and as a result, Chaos takes over and becomes too strong for Rosso to handle, resulting in her fleeing.
She meets Vincent again in Nibelheim in the Shinra Mansion, where she steals the Protomateria, the key to controlling both Chaos and Omega. This time, she is prepared to deal with Vincent and might have killed him if not for the timely intervention of Yuffie Kisaragi.
When the WRO launches its assault on Midgar, Rosso is shown briefly fighting with Cloud Strife. The exact outcome is unknown, though both Rosso and Cloud survive the encounter, suggesting there was no victor.
Rosso confronts Vincent for the final time in the old Shinra Headquarters. They engage in an all-out battle and Rosso is defeated. Badly wounded, Rosso, prideful to the bitter end, tells Vincent that their time together is finished with and that Azul will be waiting for him. She then tells him that he would not have the pleasure of killing her. Defiantly yelling "No one will ever stand above me!", Rosso collapses the portion of the building she stands on. She plummets down, laughing maniacally to her probable death.
- Main article: Rosso (Boss)
Rosso is fought as a boss in the Shinra Headquarters.
Her name is the Italian word for red, though the -"o" ending should be replaced with -"a" in keeping with gender, meaning that her name is technically masculine in Italian. Her name is essentially "Red the Red".
- Rosso shares her Japanese voice actress with Ultimecia from Dissidia Final Fantasy and Dissidia 012 Final Fantasy and Arecia Al-Rashia from Final Fantasy Type-0. Her English voice actor also voices Nora Estheim in Final Fantasy XIII.