Sister is a main supporting character in the anime and manga series 'Arakawa Under the Bridge.' He is a former British mercenary who now acts as the priest for the community living under the Arakawa Bridge. Despite his intimidating appearance, muscular build, and penchant for wielding firearms, Sister is deeply caring and protects the residents, especially Maria, whom he secretly loves. His character brings a blend of comedy, action, and unexpected tenderness to the series.