What I really like about Funko is how much passion they put into their figures with details and such. So much that they even go back to the old designs when coming out with the ad icons. They're all the vintage designs and I love it. So much Nostalgia. So I did some research and found some pretty cool vintage mascots that Funko should make. Here are my suggestions.
Old Chuck E Cheese-This picture gives some ideas for different variants which would be insanely popular
"Stew Leonards" Cow
7up Fresh Up Freddie!
Seltzers, Speedy! By the way a black and white variant would be great, considering we got a Color and B&W one for the wacky wobblers.
Pizza Pete from Pizza Hut
Sprite Boy: Also would be cool for a B&W variant
Ipana Toothpaste Beaver: B&W, and B&W Flocked?-That would be a first
Vlasic Stork with Pickles