What is onii-chan?

"Onii-chan" (お兄ちゃん) is a Japanese term that translates to "older brother" in English. It is an informal way for a younger sibling, particularly a younger sister, to address her older brother. In Japanese culture, using terms like "onii-chan" often conveys a sense of closeness and affection within the family.

This term is also commonly used in anime and manga, where characters address their older brothers with affection or sometimes teasingly. As a result, "onii-chan" has gained some popularity among anime fans worldwide and is often used in fandoms and related communities to express endearment or to reference character dynamics seen in Japanese media.