KNT Art at Character Designer Tenko's Blog

[blind2d]

Speaking of Polly/Pururun...https://ameblo.jp/qqgf7he9/entry-12965439264.html 

[rapappathepepper]

While your signature asks "Why doesn't Guido have a stinkin' bell?", I ask why does Polly and Francine have hair... But no one else? I mean... When Polly wears something else that isn't their pizza work clothes or battle gear, there's hair under the helmet, but Guido and Speedy never take them off. Even when they're at a bath house, just wearing towels, they still wear those helmets. 

[KageReneko]

Their traditional hair style don't look as good as Pururun's and Otama's... Also, Yattarou looks taller with his helmet on.