in character

mid-14c., carecter, "symbol marked or branded on the body;" mid-15c., "symbol or drawing used in sorcery," from Old French caratere "feature, character" (13c., Modern French caractère), from Latin character, from Greek kharakter "engraved mark," also "symbol or imprint on the soul," also "instrument for marking," from kharassein "to engrave," from kharax "pointed stake," from PIE root *gher- "to scrape, scratch." Meaning extended in ancient times by metaphor to "a defining quality."

Meaning "sum of qualities that define a person" is from 1640s. Sense of "person in a play or novel" is first attested 1660s, in reference to the "defining qualities" he or she is given by the author. Meaning "a person" in the abstract is from 1749; especially "eccentric person" (1773). Colloquial sense of "chap, fellow" is from 1931. The Latin ch- spelling was restored from 1500s. Character actor attested from 1861; character assassination from 1888; character-building (n.) from 1886.