Battler Ushiromiya is the main character of Umineko No Naku Koro Ni and the love interest of Beatrice. In the first half of the series, Beatrice challenges Battler into a game to get him into believe that she killed his family using magic. It's eventually revealed Beatrice actually was trying to get Battler to win and understand her heart. He eventually finds the truth of Beatrice's games, but too late since she already gave up and left herself die. He creates a new Beatrice and when that Beatrice gains the original's memories, they get married.
Beatrice is actually a split personality of Sayo "Yasu" Yasuda, who is also Shannon and Kanon. Shannon fell in love with Battler when they were little and they discussed about mystery novels when he visited Rokkenjima. One day, Battler made a careless promise to come back to take Shannon away in a white horse. Shannon took it seriously and suffered a severe heartbreak when he never returned and then forgot to write a letter for Shannon. Shannon then gave her love for Battler to Beatrice, a metaphor for Sayo trying to forget about Battler and move on, but those feelings never completely disappear.