Soul

Soul is the Quirk used by Rody Soul.

Description
Soul manifests itself as Pino, a small pink bird-like creature, and is always active. Pino is connected to Rody's soul and her actions reflect the innermost feelings of Rody.

Weaknesses
Due to Soul's nature, Rody is effectively unable to lie, as Pino would reflect his inner feelings, which may be different from the one he is expressing.

Usage
Rody gets embarrassed when sharing his Quirk's function to other people, however Soul was deemed a great Quirk by Izuku Midoriya.

Despite being unable to lie to other people, Rody can use this to his advantage, most notably when he uses Soul to feint his actions. This is demonstrated during the final fight against Flect Turn, when Rody was seemingly about to betray Izuku, but Pino revealed that his actions were a lie.

Trivia

 * Despite Rody being male, Pino is referred to as a female.
 * Soul is the second known example of a Quirk taking the form of a living being, the first being Dark Shadow.