Yusuke has two things of possible interest: one, he has a Persona, which spiritually is kind of wonky and weird to define, but my best answer is something like a strong metaphysical spirit that is attached to his soul. It gives him magic and combat abilities, but only under special circumstances. So it's there, but it's not doing anything unless he summons it.

The other thing is that while he's mostly cooled off on vengeance due to his former sensei now being in prison, "being unfairly wronged" by society and shitty adults is a theme for every Phantom Thief, and the desire for justice over wrongdoings still simmers deep down. So it's there, just low-key.