"Ryouga" was a soldier who fought under Abelia Schillfelt's command during Chronicle 18.
Ryouga appears in Soulcalibur IV in tower of lost souls ascend mode under the floor "No Man's Land" using Mitsurugi's style and teamed up with Setsuka.
In Soul Calibur Broken Destiny Ryouga still uses Mitsurugi's style but he appears in endless trial only.
Soul Calibur IV Skills & Details
Auto Impact A
Auto Grapple Break B
Ascend Mode Floor: No Man's Land
Partner: Setsuka
Weapon: Shishi-Oh (1P)