Persona 5: The Phantom X is a recently released (April 2024) mobile/PC RPG with strong backing from notable publishers like Sega, Atlus, and Perfect World Games. Its association with the well-known Persona franchise and release across mobile platforms suggest a moderate but sizable player base, especially in Asia. However, it is not marketed as an MMO—it's primarily a single-player turn-based RPG with limited multiplayer features, so it doesn't fit MMO criteria.