CyberDuke

Depends what counts and how forgotten they are in your ranking list.

If to consolidate between different cartoon companies starting with Disney, it'll be easier to search through the 1940s, 1970s, early 80s, and the 2000s on the movies and shows since they're not mentioned as often as many other decades. Or maybe the segments from the 1930s of both Disney and Looney Tunes, I've enlisted events with some reinterpretation. Like Porky Pig's old friend named Gabby Goat or Donald Duck's friend Peter Pig before Donald ever met Mickey and Dippy Dawg (Goofy's original name)

But if you want to go beyond cartoon-search, I've seen a couple anime shows that would be very rare for anyone to know. Like the 1984 series known as Giant Gorg. You could only find very few fanfics if to search around.

That's great, I always like to see any overlooked-characters get into the spotlight for a change.

That's what I've been doing with many overlooked Disney characters (Like Bongo, Zeke Midas Wolf, Bonkers D. Bobcat, etc.) in my crossover RP I'm still making with a friend.