Your hint is:She wears a costume on her own TV show.
Who says, "The best word I know is F-U-N. F-U-N spells fun. Fun is nice, I like fun"?
All characters and underlying materials (including artwork) © Marc Brown.
"Arthur" and "D.W." and all of the ARTHUR characters are trademarks of Marc Brown.© 2015 WGBH