con·fi·dant 
(kŏnfĭ-dănt′, -dänt′, kŏn′fĭ-dănt, -dänt)
(kŏnfĭ-dănt′, -dänt′, kŏn′fĭ-dănt, -dänt)n.
1. One to whom secrets or private matters are disclosed.
2. A character in a drama or fiction, such as a trusted friend or servant, who serves as a device for revealing the inner thoughts or intentions of a main character.
[French confident, from Italian confidente, from Latin cōnfīdēns, cōnfīdent-, present participle of cōnfīdere, to rely on; see CONFIDE.]