Erel Kersos was a Corellian Human male surgeon. Following the assassination of Admiral Tarnese Bleyd, Kersos took over as the Commanding Officer. He was placed in command of a MedStar-class frigate during the Battle of Drongar.
When Kersos Erel was younger, he was estranged from his family because he chose to marry Feleema, who was not from his world. After they had been married for six years, she passed away in an incident that occurred on Coruscant. Following this, he dedicated his life to his political aspirations.
During the Clone Wars, Erel achieved the rank of admiral within the Republic Navy. This promotion occurred while he was stationed in orbit above the planet Drongar after Tarnese Bleyd was murdered by an assassin in 20 BBY.
While serving on Drongar, he encountered his nephew, Jos Vondar, who was also in a relationship with someone from another world. Discovering this, he intervened in their romance, hoping to spare Vondar the suffering he had experienced. However, he ultimately reconciled things and went back to Corellia with Vondar and his ekster love Tolk le Trene after the Battle of Drongar, intending to reconnect with his family.