Unlike his twin sister, Juleka, Luka is described as a calm and reserved boy who also has a mixed personality of being playful, charming, mature, and flirtatious. He is empathetic at reading people's emotions and usually expresses them through music.

Luka is also very kind and generous, especially towards his friends and family, but also to people he just met, like when he cheers Marinette up shortly after meeting her. Like Adrien, he is also supportive and encouraging towards others like Julek