I don’t know what Natsume Yuujinchou is…. I also never finished Persona 3, I made it to like October then got distracted by something else, and never went back because I couldn’t remember where I left off.  Though I can try to answer:

• Favourite Female:  Mitsuru, something about the characters who already participated in the rodeo, as in, you go to them and they’re like, “Hey there you’re new but this is how this whole fighting monsters thing works.”  I also like that in Arena, her and the others grew up, and she flat out told the Investigation Team, “Stop what you’re doing we’ll handle it,” not because she didn’t think they could do it, but because they’d have to sacrifice their lives and she’s already been down that road before.
  
• Favourite Male:  Akihiko, same reasons as above..  
• 3 Other Favourite Characters:  Junpei, Aegis (who I initially didn’t like then I grew to love her), Elizabeth.  Added bonus of Minato (though it’s kinda hard to like the character that is you, because you’re picking their personality, versus Souji/Yu who had a personality in the anime and Arena, but once the movie comes out I feel like I’ll love Minato)
• 3 OTPs:  Shinji x Akihiko, the OT3 of Shinji, Akihiko, and Mitsuru, and Mitsuru x Akihiko.  I never got to the part about Junpei and that ending with Chihiro but I’m sure I would’ve liked it.
• Notp:  Can’t think of one 
• Funniest character:  Junpei, I always like the ones who tries to be the comic relief in a terrible situation, ever since Sorata and X/1999.
• Prettiest character:  Mitsuru
• Most Annoying Character:  Can’t think of one.  I use to not care for Aegis but she grew on me, and Yukari too.  I was kinda like, “eh o.k.,” but then I kinda got over it.  Honestly, I like the team dynamic of Persona 4 better, because I loved them as a group.  I feel like I liked the characters of 3 as individuals?  Like I liked Akihiko and Mitsuru and Junpei, I thought Yukari was o.k., Aegis was o.k., Ken was o.k., but… I didn’t fall for all of them.  Like in P4, as much as I love Naoto and Kanji, I love the ENTIRE TEAM equally, like, I felt like we had a bond?  However, I love Persona 3, because without P3 I wouldn’t have been interested in P4.  P3 was a really, really good start to this kind of rpg of dungeon crawling and being social too.  
• Most badass character:  Mitsuru
• Character I’d like as my BFF:  Junpei or Elizabeth
  
• Female Character I’d Marry:  I would say Mitsuru but I probably can’t handle her, lol!
• Male Character I’d Marry:  Junpei or Akihiko
• Character I hate/dislike/least like:  No answer, I don’t hate anyone