Quiet and aloof, the Jack of Spades lets his pro cooking skills do all the talking. His delicate looks contrast the rigid resolution in his heart. Despite his Red Territory roots, he's joined the Black Army. He despises his older brother Jonah and often tells him so, but the latter seems oblivious.

Luka has a slightly rounded face and a mole under his left eye. Luka's eyes are amber coloured. His dark purple, shoulder length hair is pulled back into a side ponytail.