Just wondering what characters have slipped through the cracks without representation (or maybe even decent representation ).

Because I myself don't have an exhaustive knowledge of what figures have been made I will open a second part of the question to:

What figure did you really want that wasn't available growing up?

For me in question 2, i always wanted G1 Ultra Magnus but he wasn't sold in my home town. I ended up saving xmas and birthday money for 2 years straight in the hope it would be released. It didnt happen so i got my voltron set and headed down a different path