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Illeism

Illeism (from Latin ille meaning "he, that") is the act of referring to oneself in the third person instead of first person.

Illeism is sometimes used in literature as a stylistic device. In real life usage, illeism can reflect a number of different stylistic intentions or involuntary circumstances.

Wiktionary

illeism

n. The practice of referring to oneself in the third person.