First-person singular: the grammatical person/number referring to the single speaker (e.g., 'I').
日本語で「私」は一人称単数の代表的な代名詞だ。
In Japanese, 'watashi' is a representative first-person singular pronoun.
小説を一人称単数で書くと、語り手の主観が強くなることが多い。
When a novel is written in the first-person singular, the narrator's subjectivity often becomes stronger.
英語ではIが一人称単数だが、日本語では代名詞の選び方に気をつける必要がある。
In English 'I' is first-person singular, but in Japanese you need to be careful choosing pronouns.