Persona 1 - It's either Nanjo or Hidehiko, but I think hidehiko wins it for me since he's really funny! I love his personality and I always like class clown/jokester type of characters in games most of the time! I accidently chose him in my p1 playthrough but... I'm glad I did since he always made me smile and giggle! Nanjo is a very close 2nd though; I loved his relationship with the cast and even the enemies lol

P2IS - Eikichi!!! I don't know where to begin with him... Similar to hidehiko he is VERY FUNNY! I LOVE his narcissistic personality in the game (EP also) and his character development in innocent sin IS AMAZING! His relationship with Lisa and Tatsuya throughout the game is so good... he's just a silly guy!

P2EP - I don't know if Tatsuya counts but if it does then its him, BUT if not then it's definitely Katsuya! HE'S SO CARING!!! Katsuya seemed strict at first (towards Tatsuya specifically) but he actually does care for him and the others! He always wants the best for his little brother which I love about him! His love for cats is also amazing... helios is a really cool persona...

Persona 3 - Shinjiro! I need to replay persona 3 again sometime since I haven't played it in awhile, but Shinjiro is just a really cool character! His relationship when ken is really good from what I recall. His social link in portable is really good also. Him being able to cook and helping Fuuka with it is really cute... I actually did cry when I got to October 4th since I was so attached to him back then. Even though Shinjiro is my favorite p3 character, there's so much other characters that are really close to being my favorite like Yukari, Fuuka, Kotone, Junpei and many more!

Persona 4 - RISE!!! SHES AMAZING!! SHES MY ALL-TIME FAVORITE CHARACTER!! HER SOCIAL LINK IS AMAZING, HER CHARACTER IS AMAZING, HER DESIGN IS AMAZING, HER RELATIONSHIP WITH THE INVESTIGATION TEAM IS AMAZING!!! Persona 4 is my favorite persona game, and the main reason is because of rise lol... her flirting with Yu is adorable and her teasing Kanji is funny... she's just really cheerful and cute overall... and her persona is very cool!

Persona 5 - Akechi! He used to be my favorite persona character when the only persona game I played was Persona 5 Royal lol... but he's still one of my favorite characters MAINLY because of 3rd semester. His rivalry with Joker/Ren is REALLY GOOD IMO! I loved his confidant and I still do! The Royal Trio is one of my favorite trios mostly because of Akechi! I would always go to the jazz club with Akechi since I was so obsessed with him back then... and even today I would still only go to the jazz club with him lol... His relationship with Joker is beyond amazing especially in the 3rd semester... also his personas are VERY VERY COOL. I love lokis and herewards design (they're still one of my favorite persona designs)! Akechi will always be one of my favorite characters!