Confidant

The confidant (/ˈkɒnfɪdænt/ or /ˌkɒnfɪˈdɑːnt/; feminine: confidante, same pronunciation) is a character in a story that a protagonist confides in and trusts. Confidants may be other principal characters, characters who command trust by virtue of their position such as doctors or other authority figures, or anonymous confidants with no separate role in the narrative.