At first glance, Langris seems to have a pleasant, happy-go-lucky personality. He smiles even in the midst of battle and possesses a great deal of confidence in his abilities. Like most nobles, this borders on arrogance.[8] He also possesses a large degree of vanity and self-importance that is characteristic of many nobles, including their disdain for those they believe are beneath them. Peasantry sticking up to him or overlooking his clashes with his worldview and fuels his rage and inferiority complex. However, Langris is also very sadistic, as he tries to kill his older brother after defeating him. Despite being known as the talented brother, Langris shows a deep grudge against Finral as Finral was always praised for being kind and well-liked by others. His hatred for Finral grows after seeing others rush to his aid after Langris cut him down.

Langris Voice Actor: Clifford Chapin

Reference: https://www.youtube.com/watch?v=eUemCnluTf0