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 humour. 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.

He often fears coming across as cold and detached in his composure, the fears of which hold heavy weight on his thoughts, as he bears guilt about his inability to genuinely put his heart into his own performance as a soldier, and it feels strange and weird to him as a consequence. This ends up being his biggest strength, as he is able to stay calm at the direst situations, even when learning disastrous news.

While Lukas has the behaviour of a noble, he isn't incapable of recurring to underhanded tactics, such as taking Rigelian civilians as hostages and threatening to execute them if safe passage is not granted for the Deliverance, causing even someone like Slayde to be surprised at the use of such a method.