“As per tradition of the Megami Tensei franchise, he is a silent protagonist, whose personality is based on the player's actions and decisions. However, he appears to have more established traits than any of the previous protagonists. His dialogue options range from somewhat indifferent to outright cheeky. The game allows for quite a number of playful, snarky or audacious answers, including teasing his friends. He also taunts his enemies like the famed Arsen Lupin. In the prologue scene, he remains cocky and confident even when his life is in danger. He also has a flair for showing off and making dramatic decisions, such as exiting by jumping through the stained glass windows of the Casino, much to the amazement (and mild annoyance) of the other Phantom Thieves. This is even reflected in gameplay, as when he is turned into a mouse, he makes a flamboyant hop after escaping a battle.” - Persona 5 Wiki

Voice Examples

https://www.youtube.com/watch?v=pbTt0iz-Wvc

https://www.youtube.com/watch?v=lSi-dr_X3As