Toon Books Comic Maker. It's a cute editor where kids can create their own stories in comic format. While I was exploring Professor Garfield's website and reminding myself of Comics Lab, and Comics Lab Extreme, both great places for kids to create comics, I noticed an orange bar, just above the three panel strip I was making. I pressed it and discovered a feature I love, the Character Builder.
It's a lot like an avatar maker, except you only save your character to the comic template, rather than to your own computer. Of course, you can always take a screen shot of your character if you want to use it in some other project. Top left is a screen shot of what the Builder looks like.
Character Builder, find Expand Character Builder, just above the panels. When you expand it, you get a character to customise. Choose skin tones, head, eyes, mouth, ears, nose and body. Many features can also be resized. Once done, you can save your character, provided you've logged in (just a christian name or nickname is necessary for this.) If you like, make more characters, or get random ones.
If you're interested in avatars and how to use them with children's writing, you might enjoy my articles, Writing with Avatars (1) and Writing with Avatars (2).