Luka (루카 , Luka) is one of two females canine people that was first seen in the "gym for female canine people only" at The Cage. There aren't much information about Luka besides the fact she is a friend of Canhong and Rian. Her name was only mentioned by Canhong when she was killed by Baylord Paul, but in fact, we are not exactly sure which one is Luka and which one is Rian between these two name of female canine people.
By going with the speculation that the bulky and tall in build female canine people is Luka (read the Notes and Trivia section), she has gray skin, gray hair, eyes that are closed with red markings around them, with brown dog ears hanging on the side of her head. She wears a training gear suit with Yama's Gang's insignia, the three fangs, on the front side of the chest. She is more quiet than Rian and usually does not say much. She also seems to supportive of Canhong and want to help her to gain fame and name in The Cage, because she also decide to follow Canhong to beat Deng Deng.
She was first introduced in the female only gym together with Rian, as the friends of Canhong. She was killed by Baylord Paul along with Rian and Canhong. But, later in the story, Canhong was revealed to survive thanks to Khun Aguero Agnis that healed her wound with the flame of Yeon Family that reside within him. There are no details whether Luka was also healed by Khun or not.
Luka and Rian following Canhong.
Luka and Rian being killed by Baylord Paul.
Luka and Rian's injuries seemingly having been healed.
Based on speculation of psychological situation of Luka's and Rian's standing position when they were killed by Paul, it seems that Luka is the bulky, tall in build female canine people. This is because Canhong mentioned Luka's name first and then Rian. And the person who is laying death on the ground in front the other victim is the bulky female canine people.
Because Canhong is a C-Rank Regular, then it's safe to assume that Luka is also a regular, although her regular rank might not be the same as Canhong.
There are no details whether Luka was also healed by Khun. Whether she is actually alive or not, remains unknown. It's safe to assume that she is dead, for now.