Miga is a young sea bear which is actually part killer whale and part Kermode bear ( a rare white bear only found in British Columbia). She is based on some legend
Quatchi is a young sasquatch from the mysterious forests of Canada
Sumi is an animal spirit from the mountains of British Columbia....
So this is all very interesting. I found it all on the vancouver2010 website. They have a lot of information and cool stuff there.