Who is the final boss in Persona 5?

Can you enlighten me on the identity of the ultimate antagonist in Persona 5? Who holds the reins of evil in this intricate narrative, leaving players on the edge of their seats as they unravel the mystery behind the Phantom Thieves' ultimate foe? Is it a powerful entity that has been lurking in the shadows, orchestrating events from afar, or perhaps a character who has been with us throughout the game, hiding their true intentions? I'm eager to uncover the truth behind the enigmatic question, "Who is the final boss in Persona 5?