Mass Effect - Rebirth
Cassius Cleon is a Turian with a military bearing and a certain degree of natural charisma.
Cassius Cleon was a slave to Batarian masters for a time. The details of his servitude he has thus far kept to himself, but he has demonstrated an unusual understanding of the finer points of Batarian culture. He rose to de-facto spokesperson of a motley collection of former-slaves and took part in discussions with the Omega cell of Cyeria station to ensure the safest possible relocation options for his fellows.
Cassius himself ended up joining the Omega cell as crew for their ship, the Persephone.