a personal or private matter / (by extension) selfishness

personal, private / secret

a personal or private matter / selfishness / privacy, secrecy / (women's speech, obsolete) a brother-in-law

private; mine

(formal) first-person singular pronoun: I, me

original character (a fan-created character in a fanwork)

(fiction) generic bystander character, extra

official song themed around a fictional character

(fiction) subcharacter

(fiction) main character