Marshal is one of my favourites, haha. But apart from him, some of my favourite villagers are: Chief, Ruby, Katt, Fuchsia and Papi.
Chief because I have had him in my wild world town for a very long time, and I find him so fun to chat to. He's mostly the reason why I go on it these days, to see what he's up to. I find him waaay more entertaining in older games than New leaf. I'm still yet to get his picture in that game.
Ruby because she was my first villager best friend, and the first to give me her picture. At first I thought she was really scary because she looked like she had jewels for eyes, but then I got used to it and I actually like her a lot. She'll always be one of my longtime favourites.
Katt was a villager I wanted to try because so many people were hating on her. So I thought she can't be that bad, and invited her into my town. She really isn't bad imo, she's actually quite pleasant. Her design suits the uchi personality very well, which is meant to be sort of tomboyish. So that's kind of why her appearance is like that.
Fuchsia was an uchi I kept wanting to invite into my town for the longest time but whenever I did, i'd always end up getting rid of her for another uchi. My most recent town that I invited her into was the one before my most current. She lived there up until I reset it, and I made a point of talking to her everyday. She was pretty cool too. I really enjoyed conversations with her.
Papi was one of my first villagers in new leaf, and since I didn't like any of my other starters he was the one I talked to the most. He's so childlike and sweet, I can't help but love him. He's nothing but nice!