Ralo was a Human male soldier within the Republic Army, holding the rank of Sergeant and serving the Galactic Republic.
During the year 3636 BBY, Ralo took part in Darth Marr's Wild Space expedition. He was stationed on the flagship of the fleet. The Eternal Fleet set an ambush for the mission, deploying boarding pods filled with skytroopers. Ralo briefly fought alongside the Commander, a galactic hero, while trying to defend his sector. With Marr's flagship being destroyed, Ralo was ultimately compelled to abandon the vessel.
Following the disastrous battle, Ralo became a member of Koth Vortena's band of outcasts, eventually seeking shelter on the shadowport known as Asylum. Five years after the Eternal Empire's conquest, he would eventually reunite with the Outlander when the latter, together with Koth, Lana Beniko, HK-55, and Senya Tirall, arrived on the Gravestone. He later assisted the crew in their raid on the Scions' secret base.
When the Eternal Empire later invaded Asylum, Ralo remained loyal to his comrades, helping to defend the Gravestone until they were forced to evacuate.
Ralo is a character featured in Star Wars: The Old Republic's Digital Expansion, Knights of the Fallen Empire. His initial appearance is in Chapter I: The Hunt.
Within Chapter I: The Hunt, the player is faced with the choice of rescuing a group of besieged troopers in the hangar, and later must decide whether to issue an evacuation order or ram the Eternal Fleet. Upon meeting Ralo in Chapter VI: Asylum, he will comment on the player's decisions made during these events.
During Chapter X: Anarchy in Paradise, Ralo will depart from the Eternal Alliance alongside Len Parvek and Koth Vortena. It's important to note that this event hinges on the player's decisions concerning Koth (specifically, permitting the sun generator to reach a critical state and being an accomplice in Kaliyo's bombings) and does not depend on any action related to Ralo.