Juuza Amakusa is an antagonist in Umineko no Naku Koro ni.
Juuza is a tall, short-tempered young man who was hired by Eva Ushiromiya as a bodyguard for her neice Ange Ushiromiya, whom she later grown to hate. However, he was fired from his job as a bodyguard, because he not only spoke with Ange, he flirted with her. A few years earlier, he was a member of the Yaminu in the Higurashi series, and he fell victim to one of Satoko's traps. It was unknown what happened to him during those few years after the When They Cry series. It would also seem that he has more loyalty towards Okonogi rather than to Ange herself.
In the Meta-World of the Dawn of the Witch game, Amakusa reveals himself to be a money-obsessed individual. He murders Kasumi and her folowers, and in the bad ending, he betrays Ange and murders her as well. If you get a slightly better ending, Ange turns the gun on Juuza and shoots him with it.