Bak Chang

Bak Chang is the leader of the Black Order's Asia Branch, a post occupied also by his great-grandfather (and perhaps the other generations of his family). He and Komui seem to be good friend as Komui address him as Bak-Chan (Dear Bak). Due to Komui's sister complex, Bak doesn't let him (or anyone else) know about his secret stalker-ish crush on Lenalee, and this fact was used by Allen Walker to threaten him so he would open the door where Fou was fighting with an Level 3 Akuma.

Personality
Like Komui, he is a man completely aware of his duties and will follow God's will strictly. Even not being a Conformer, he is able to do some spells controlling the structure of the headquarters thanks to the seal of his great-grandfather and the blood of Chang's clan. Acting as the member of the branch, he is a responsible leader. It's said his intellect is a triumph of the Asia Branch. Because he was raised like a prince, Bak refers to himself as "Ore-sama" (something like "my honorable self", "divine me", or "the great me" in English) when he is angry (more specifically, angry at Fou), but otherwise he usually calls himself "boku" (a less formal way for males to refer to himself); Fou refers to him as "Baka-Bak" (Idiot-Bak). If he gets very agitated, numerous hives appear on his skin (especially if someone refers to his secret obsession with Lenalee). His hives also appeared when he was forced to lock Fou into a room to fight a Level 3 Akuma, and he even cried without his own knowing, proving that he cares greatly for her.

History
When Allen was defeated by Tyki Mikk and had his Innocence destroyed, Bak took the young exorcist in, training him to regain his Innocence, until Thread, a Level 3 Akuma attacked their headquarters. After Allen and Fou had their molecular bonds weakened by Thread, Bak refused to let either of them reenter battle, until being threatened by Allen about his collection of Lenalee's pictures, which resulted in Bak eventually opened the door, allowing Allen to enter. After seeing Fou is seriously injured, he went to her and trying to protect her.

Bak is later seen exploring the captured ark, and he then attends a meeting with other important members of the Black Order. He shows utter disbelief at Malcolm C. Levrier's comments regarding Allen as a possible traitor. Later, after Lulu Bell and the Akuma began to attack the research center, he managed to avoid capture, and he has helped Allen in the fight by using Finder's equipment to entrap Akuma.

He was seriously injured during the struggle to protect Headquarters from the Level 4 Akuma, but survived with most of the victims of the Science Department and assisted the Black Order as they were moving to the new Headquarters.

Trivia

 * Bak has a crush on Lenalee and owns a photo collection of her. When Allen threatened to tell everyone about this collection, it scared Bak into submission, at the thought of Lenalee's tears and Komui's wrath.
 * Fou tells Allen that a person once was lost in the Asian Branch for a week and nearly starved. Bak is undoubtedly this person, as he jumps and quietly scoffs at the comment.
 * After the accident with Komuvitan D, Bak was the one who made a vaccine and cured everyone.
 * Bak had long hair - just as Komui Lee - when he was younger
 * Although it is not revealed yet, some fans believe that Edgar Chang Martin, Assistant to the Head of Asia Branch in Ch. 190, may be his father.