User blog comment:KatDWolf/Idea for Hetalia Children's Story/@comment-1701718-20100919122840

You could get in trouble for useing the Hetalia characters.It would be considered plagiarism if you use the characters to make a story, then get a grade off of it. Fan fictions are NOT for school work. Its for fun.

The only legal way you could use the characters is if you mention the names in a bio your writing for your teacher on your favorite things, or if you are writing a fan fiction for your own enjoyment.

If you're going to make a story like Hetalia, make it based off of it. Use your own characters and settings. But first, ask the teacher if that's ok.