I tend to like the obscure heroes. The ones i tend to like are:
Captain Marvel. Probably the least obscure hero I favor but these days he's see as a second tier hero at best. Worse, most know him as Shazam, which is just silly.
Star-Lord. A weird Marvel cosmic hero, like the Silver Surfer, who traveled space with his sentient spaceship called "Ship" and got into weird sci-fi adventures.
Mad Hatter. Now we're getting into weird golden age public domain stuff. This guy was a lawyer who would put on a silly outfit to fight crime. The only thing liking the character to the Alice In Wonderland character was his perchance for speaking in rhyme and the symbol on his chest was a top hat. So a weak connection. It's the kind of hero I would come up with.
Spider Queen. Another now public domain character who could spin web-like thread using her bracelets, but had no other spider powers. What I like about her is that her costume in no way implied spiders. It was a generic super heroine costume that someone decided to use for the character.
Kitty Kelly. This one is especially weird even for the golden age. You know how professional wrestlers will change persona? When comic book characters will do that, too. Kitty Kelly, not the trashy author, started as a plucky airline hostess aiding in the war effort. Later she gained super strength adopted a costume and the moniker Yankee Girl, not to be confused with another character with that same name from the same publisher. Then in her fifth and final appearance, she dropped the hero name, but retained a uniform with her initials "KK" on her chest. This final incarnation appeals to me because it makes no sense for a super hero's super identity to have the same name as their civilian identity. It makes the costume redundant. At least she didn't wear a mask to make it even sillier.
If I can add an original idea, I had an idea for a hero called Eggman who wore a full, yellow mask and an oval-shaped white cape so he looked like a fried egg. I think the idea has great movie potential.