Acharacter in a play provides the most truthful revelation about himself when the playwright has him speak in a(n) dialogue/aside/soliloquy.

A soliloquy is a form of speech in a play that provides the most truthful revelations about a character’s true identity. It came from the latin words solo, “to oneself,” and loquour, “to talk.” It is used to depict a character’s real thoughts and feelings shared to the audience. It gives a dramatic effect to the scenes as a form of reflections that are unspoken by the character.

Emotional appeal, plain folks, and bandwagon