Part of the reason why Persona 4 became so popular was its integration of RPG elements mixed with a social game. Players assume the role of Yu, who is a student by day and an otherworldly warrior at night. It sounds weird, but it came together terrifically well. Of course, this can all be attributed to its predecessor, Persona 3, which first adapted these elements into the series. There were some rough kinks in the series' first attempts to combine these genres, and Persona 4 perfected a lot of the kinks to make for a smooth and refined experience.