Lau (劉 Ryū; Chinese Pinyin: Liú) is a Chinese nobleman and a member of the Shanghai Mafia, leader of an opium den and head of the British branch of a trading company, Kunlun. He is also a friend of the Phantomhive family, as he aids both Ciel Phantomhive and Angelina Durless at various times.
Lau is a generally easy-going, carefree man, although he does have some odd tendencies. He keeps a variety of women with him, and even refers to his personal assassin, Ran-Mao, as his sister, though not related by blood. Despite not being related, though, he has known Ran-Mao since they were young. He apparently treats these girls well, as he takes them out for treats and special occasions, much to Ciel's surprise.
He also has an odd tendency to say or act like he knows something, only then to reveal that he actually does not, which is a point of annoyance for those around him which is added for comedy. Sebastian calls this behavior "typical of a yes-man."
He has shown that he has a slight propensity toward violence, as he told Ciel that he would kill Agni if he was Harold West, much to Ciel's great surprise, as he found that a bit excessive. Also, in his zeal to help Sebastian during his magic trick, which involved stabbing a chest that Sebastian was in repeatedly, he actually managed to cause Sebastian pain, which even surprised him.
However, despite his oddities, he seems completely oblivious to how strange he appears to be to others.
Lau is a Chinese nobleman, and as such, dresses in Chinese clothing, including a Tangzhuang. He has a tendency to keep his hands hidden and clasped together in his overly long sleeves. The only time he wore anything different was when he went to Aleister Chamber's party as Angelina's lover, when he dressed in a traditional suit. He is 177 cm (5'10") tall.
He is notable for the fact that he almost never opens his eyes, and the few times he has opened them from more than just slits, his eye color is shown to be a dark brown. He also has short, black hair.
In the anime, he is typically shown with his arms wrapped around at least one of his women, usually Ran-Mao. He is also depicted as frequently indulging in smoking opium.