Please do not create separate articles for "guest stars".
If you need a link to a guest star on a page (ex. this one), don't create a separate article. Instead, link to their article on Wikipedia or another wiki.
The only exception is if you need to state their role in the WordGirl universe on a separate page, rather than on the "fan-episode" page itself (i.e. they are in more than one or two "episodes"). I will check to see if you have a good enough story for them.