(narratology) A literary device in which the author writes himself or herself into the story as a character.

plural of self-insertion

(fandom slang) A character in a story who represents the author's own person. / (fandom slang) A character in a story who the reader/viewer is meant to identify with.

To insert oneself. / To insert something into one's own body. / (fandom slang) To insert one's own person into a story as a character.

plural of self-insert

Third-person singular simple present indicative form of self-insert