When you first become a resident of Second Life you may choose a new avatar, or you may be randomly assigned one. I know that the last time I rolled up a new alt, I ended up as a 'Bitsy', as did the avatar in front of me, and the one behind. After you finish orientation you have a choice of at least fifty "Off the Rack" avatars - you can find them under the 'Avatar' tab where it says "Choose an Avatar." There are also an assortment of older avatars in your "Library" folder in Inventory.
One of the reasons I am adding these pages is that I could not find good full view pictures of the available avatars. On my selection bar it only shows the avatars from the waist up, and I'm embarrassed to admit that I did not realize that two of the fantasy avatars came with horses.
Some of them are also wearing items of clothing or animations you can scavenge to mix and match later. As you try on each avatar, I suggest you click on the t-shirt icon. Look for the tab that says "Wearing" and save the entire outfit, avatar and all.
There are four categories of avatar under the 'Choose an Avatar" tab -- "New", "Fantasy", "Vampire", and "Classic". I am going to discuss each category in a separate entry.
All of the female avatars come with a female avatar animation over rider (AO), and the males come with a male AO. Basically this means that when you are walking, you won't "Walk like a duck". (more on this later).
All of them are wearing alphas to cover parts of their body, so that if you take off some of their clothing you will just see blank spots. The alphas are there to cover body parts that might show through the clothing.
These avatars came out in January, 2019.
See Inara Pey's blog.
Bitsy: This avatar comes with a tablet in one hand and a bag with a Chihuahua in the other. You can detach the bag, the tablet, and the jacket, but if you take off the hat you will also take off her hair.