Kell (켈, Kel) is a teammate of Yool who assists him in the capture of Yeon Yihwa and Hong Danhwa. He and Yool knew about Levy.
He has dark grey hair and grey eyes. His face is half covered in mask, and he wears a metallic blue armor. He seems to be augmented with electronic implants that can be seen in his hair. He follows Yool's orders, and is usually quiet and stoic.
He is first shown at the beginning of season 3 as he makes Yihwa faint. He later accompanies Yool to confront Baam, then goes with him to assist in the rescue of Deng Deng.
His power and abilities aren't really known yet, but he is strong enough to make Yihwa faint when she is half poisoned.