Onii-chan

お兄ちゃんonii-chan
Quick definition:Onii-chan is a Japanese way of addressing or referring to an older brother, using an affectionate ending, and in anime it can also be used for older boys who are close friends.

Meaning

Onii-chan literally means older brother, and it is a warm, familiar way for younger siblings to address a brother. It is formed from onii, meaning older brother, and chan, an affectionate ending usually used for children and loved ones. A more polite form is onii-san, while a casual or more grown-up version is simply nii-san.

In anime and manga, onii-chan is common in family comedies and stories with younger sisters or brothers. The word signals closeness, and the way it is said, sweetly, teasingly or crossly, shows the relationship between the two characters.

Its counterpart for an older sister is onee-chan. Younger siblings are not usually addressed with a special title, and are normally called by name instead. Fans outside Japan often use these words in English to joke about family dynamics.

Origin:Onii-chan combines onii, a form of the word for older brother, with chan, a diminutive honorific that expresses affection. Japanese families have long used kinship terms like this, and anime made the word familiar abroad through the many series with sibling characters, especially younger sisters addressing older brothers.
Example:In a family comedy, a younger sister rushes into her brother's room on a Sunday morning, shouts onii-chan and demands help with her homework, while he complains and then reluctantly agrees. The word is the first thing she says, showing both her dependence on him and her affection, and he is clearly pleased to be asked.
Did you know?Japanese children also use the word for older boys who are not relatives, for instance when a small child speaks to a friendly teenager, so it works as a general term of warmth and respect for an older boy.