Depends on what they like. If like like time management, social simmy stuff, a more accessible experience and a stylish UI, Persona 5 or 4 depending on what setting they prefer and if random dungeons is a turn off. Persona 5 for QoL, Persona 4 for generally more likeable characters and a chiller vibe.
If they like gritty, oppressive atmospheres, if they have the heart of a lion and are willing to stare into the face of fear itself, SMT Nocturne HD or preferably SMT IV (or tbh SMTV) all seem like very good starting points. The series are different enough that a player who loves one might hate the other. My personal pick here would be SMTIV because it's not too challenging and the environment and worldbuilding of Tokyo/Mikado I think is more realized than Nocturne, and there are more QoL features.
If they seek death and frustration and have questionable taste, Strange Journey.