Persona is a series of turn-based role-playing games, as well as some spin-off titles that branch out into other genres. The core games typically focus on high school characters who engage in standard socialization and school-related activities as roughly half of the game, and then explore dungeons and fight monsters as the other half. The series is critically-acclaimed, and is one of the most popular series of console role-playing games.
Trophy-wise, Persona games typically aren't very hard (they have no difficulty-related or online trophies, and only mild missable trophies), but they require a significant time investment. The games themselves are often 50 or more hours long, and obtaining all trophies can take twice that amount of time.