Lol, is Ann your favorite? I like Popuri. ^_^ She's so pretty and she loves nature and plants like me! I have some sort of Anim? picture of the main characters:
http://www.hmfarm.com/images/hmad.jpg It shows Ann too. ;P It is an ad for Back to Nature that I found. And for anyone who doesn't know who's who, I'll explain. (I'm doing full profiles, lol.) Though these character bios are based off of the N64 game; I've never played BTN. Someone who has can certainly add in their bios from BTN, considering their personalities and histories are a lot different.
The guy in the middle, holding that cute little dog, is Jack. (The default name, though you can call him anything you wish) He's the main character that you play. His look varies from the different games. That version is what he looks like on Harvest Moon 64, Back to Nature, and some other GB games from what I know.
The girl on the far left is Karen, one of the girls you can marry. She lives at the vineyard with her mother, Sasha, father, Gotz, (I think. o_o Uhh...) and co-worker Kai, who stays with them. She's very tempermental at first, but she'll warm up to you once she learns that you're a nice person.
The most notable of the characters is probably Popuri, who's almost right behind Karen. The reason why is because of her pink hair. It's always easy to tell who she's related to. o.o; Anyways, she lives at Florist Lilia with her mother, Lilia, and father, Basil, who is a Botanist. She adores nature and flowers, and loves to see you fill your farm with them. She also enjoys sweets, and going to the mountain.
The one with orange hair, near the little sprite is Ann. She lives at Green Ranch with her father, Hall, and brother, Grey. The first time you meet her she'll ask you if you like horses, and if you say yes then her father will let you have their baby one. Considering she loves animals, she'll often visit your farm to check on how your horse is doing, and always hopes that you'll enter the next horse race.
The little one in the back is Elli, another bacherlorette. (sp?) She's very sweet, and is more of the mother-figure of all of the girls. She works at the bakery with Jeff, the master, and her grandmother. Her cooking skills are awesome!
The girl with black hair is Maria, and she is very shy. She works at the library, and is the Mayor's daughter. At first she'll barely speak, and is very afraid of your dog, but later she'll warm up to you.
The two little boys in the picture are Kent, (brown haired one) and Stu. (black haired) Kent is very energetic and sort of nosy sometimes, but he's also pretty friendly and likes to hear about any new animals you get at your farm. Stu, though, is very shy and likes flowers, though he won't dare tell anyone but you. He's cute, though. =D
The man in red is the Mayor of Flowerbud Village. (The town you live in) He lives in one of the nicer houses in the village, and often offers some advice for starting out in your new home. Maria is his daughter, as you know.
The cow... Is just some cow that can stand up. o_o LOL. I would do more profiles but my mom's about to kick me off. e_e; I hope this helped a bit, though. If you want to know more about the characters then just ask!