Kinda wanna do a marathon of videos talking about the Persona series, not sure where to start
Persona 5 is where I started, so that makes sense
Persona 3 is where a lot of what Persona is today started to take shape, so that makes sense
Revelations: Persona is the first game in the series, so that makes sense...but as a localization it's awful, so it'd have to be the original Megami Ibunroku Persona (if there's a translation for that anywhere)
Shin Megami Tensei: If... could also be argued to be the flashpoint of Persona, since it spearheaded a lot of the concepts later proper Persona games would adapt and make defining features
So who knows, really