While he can come off as strict in his professionalism, Lukas is sweet-natured and polite to everyone he meets, and although subtle, has a dry sense of humor. He has a very well-maintained calm, reliable, and professional front, however, in the rare events that he loses his temper, Lukas's feelings slip past his said front, such an example being when a duke called him a backwater buffoon, causing him to lose his temper and beat him in a duel. - Fire Emblem Wiki