Cody Walker, also known as Hakaida. Like his brother, Cody also has a battle form, which Professor Gill named "Hakaida". Despite technically being a member of DARK's organization, he is unlike most other members as he has a strong sense of pride and tries to fight his opponents in a fair duel. Cody often announces his presence by whistling.
Cody could be quite ruthless and vindictive towards his enemies as he mocked Paul and DARK's members several times, saying that they are inferior compared to him (somewhat hinting a sense of insecurity) which shows his narcissistic side.