VOKI 

Voki is a fun tool that students can use for homework, classwork or projects. Customize their appearance and what they say, and share with others!Voki is a combination of the words "vox" and "Loki". "Vox" is the Latin term for voice. Loki is a Norse god from Norse mythology. Loki is a trickster who has the ability to change his shape. Fitting name since Voki gives students and teachers the ability to change the character's appearance and add a voice!
Here my avatar Julie talks about the differences of can,could and may. 
Enjoy!
http://tinyurl.com/y3sxzj2b