Persona 4 can be watched as a standalone series. Persona Trinity Soul wasn't received well by the fans and it technically isn't even canon, so you don't need to watch it.
Personally, I didn't like the anime that much. It did a decent job with the fight scenes, but the staff understandably needed to rush everything. Still, there were some parts they changed that left a bad taste in my mouth. Also, I just couldn't get used to some of the grating Japanese voice actors (for Rise, Teddie, and Kanji) because I was so used to the great English game voices.
I'd recommend watching a Let's Play. Persona 4 is a long game so it will take a while, but I think you'd get the best experience out of this.
· 7 years ago