A vicious monster
Don’t let the historic images limit you! Googling images for the kit I see several Harry Potter comics. (Like this bit of Harry Potter slash: A Chance Meeting. Note: preview it before you show it to your kids so you’re not surprised by unexpected questions! ;-)
If all the possibilities leave you stuck for a story, begin with the foundation of storytelling: a desire, a want, a need. One of those characters wants something. Other characters will get in the way with desires of their own. One of those desires will triumph. Or not. Maybe a dragon will eat them all ;-)
(Click the image to see mine.)
Two tips:
If you like your backgrounds consistent from panel to panel, line images up with flaws on the fabric.
Sometimes the images misbehave. (At least they did for me in Safari.) Back up to the previous panel then return.
