character has 18 distinct synonyms spread across 7 of its 10 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
an imaginary person represented in a work of fiction (play or film or story)
“she is the main character in the novel”
good repute
“he is a man of character”
a formal recommendation by a former employer to a potential future employer describing the person's qualifications and dependability
“requests for character references are all too often answered evasively”
a written symbol that is used to represent speech
“the Greek alphabet has 24 characters”
(genetics) an attribute (structural or functional) that is determined by a gene or group of genes
Synonyms, antonyms and the broader and narrower relations for character come from Princeton University’s WordNet. Full sources and licences.