Bikou

Bikou is a Monkey Youkai who is member of the Khaos Brigade's Vali Team. He is a descendant of Sun Wukong and the current Monkey King.

Appearance
A young-looking monkey dressed in ancient Chinese armor that is used during the Three Kingdoms period. Like his ancestor, Bikou has the ability to change his appearance and is usually seen in a form of a handsome young man.

Personality
He has a playful personality and is a battle maniac like Vali.

History
Being a member of Sun Wukong's clan, Bikou comes from the Mountain of Flowers and Fruit like his ancestors. He was given the title of the Monkey King sometime before the series but decided to leave the mountain and join the Khaos Brigade becoming a member of the Vali Team.

Birth of the Breast Dragon Emperor
He appears in Volume 4 calling Vali to retreat.

He reappears in Volume 5 with Kuroka to retreat but ended up fighting Tannin before the arrival of Arthur Pendragon.

In Volume 6, he and Vali appears in front of Issei who has just finish his contract with his client, Mil-tan, with Vali warning him of Diodora Astaroth. He later reappears with Vali and Arthur to witness Issei's Juggernaut Drive and the Great Red, saving Asia from the Dimensional Gap. Before retreating, he coined both nicknames to both Issei and Rias, calling them the "Oppai Dragon" and "Switch Princess".

The Heroic Oppai Dragon
Bikou reappears in Volume 7, alongside the entire Vali Team (except for Le Fay Pendragon and Gogmagog) in a temporary alliance with the Gremory Team to battle Loki and Fenrir. He was also in shock and scared when he heard that his ancestor and the original Sun Wukong is currently looking for him, saying that he is a total monster despite his age.

In the beginning of Volume 12, Bikou and the rest of the Vali Team were hiding in the Gremory Palace to allow Vali to be healed by the original Sun Wukong. Later he and the rest of the Vali Team except for their leader Vali attacked the Grim Reapers at Hades' palace in the Realm of the Dead.

Powers & Abilities
Bikou is a Senjutsu and Youjutsu user and a powerful fighter, as he was able to withstand Tannin's flame with little injuries (Tannin was also holding back at the time). He also carries a staff that can extend and retract in size and length, similar to his ancestors legendary Ruyi Jingu Bang, and can summon a golden cloud that he can ride on.

Trivia

 * Bikou's name means "Beautiful Monkey", in reference to his monkey-like appearance.
 * In the novels, Bikou is sometimes called Bikou Sun Wukong, meaning "Bikou the Monkey King".