Shaula Koshinuma is a supporting character in the anime and light novel series 'Re:Zero kara Hajimeru Isekai Seikatsu'. Known as the 'Watchtower Keeper,' Shaula is a mysterious and powerful entity who resides in the Pleiades Watchtower. She possesses a playful and quirky personality, often acting unpredictably. Shaula serves as a gatekeeper figure, testing and interacting with Subaru and his companions during their journey. Her knowledge and actions are pivotal in progressing the story, adding both danger and intrigue to the Watchtower arc.