Character profile
Koku
黒羽Black-Winged King / Killer B
Biography
Koku is one of the main characters of B: The Beginning. He works as a violin craftsman under Lily's father and can transform into a black-winged, heteromorphic being.
Story spoilers
Koku is the true identity of Killer B, whose name comes from his unusual way of writing the number "13" at murder scenes. After the attack on Jaula Blana, he spends seven years searching for Yuna in hopes of reuniting with her.
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