I hear you and I feel you on that. Sadly, a sausage fest is what it is if you started reading comics from the Golden Age on through the 90's.
Wonder Woman was probably the only real female archetype in the world of comics for decades. She was created by the educational consultant for DC Comics, psychologist William Moulton Marston. The good doctor wanted to create a hero that didn't always use his fists to solve problems, but rather do it with love. It was Marston's wife Elizabeth (Also a psychologist) that suggested this new character be a woman. Marston loved that idea and so Wonder Woman was created. Diana's personality was based on Elizabeth and the Marston's life partner, Olive Byrne. Yes, the Marston's were in a polyamorous relationship. A "throuple" if you will (Hey, I don't judge. The world got a great iconic female character and one that's still popular to this day).
But Diana was the exception. The prevailing wisdom among mainstream comic book publishers in the 40's, 50's and 60's was that only children from the ages of 6 or 7 to kids in their early teens read comics. Once you entered adolescence that was it. As soon as you discovered the opposite sex, the comics collection went right in the dumpster. (Stan Lee always felt differently about that. He always believed that more young adults would read comics if you wrote stories that were geared to them. His publisher, Martin Goodman, felt differently. Stan eventually won that argument but it would take a while.)
The publishers knew that girls read comics. I have four sisters and they all read comics. Half the comics readers in North America were girls. BUT ... the publishers believed that girls read romance and teen comedy books, boys read superhero, war and horror books and never the two shall meet. There were comics for girls and comics for boys and that was that. That's why you never saw Nick Fury or Daredevil guest star in Millie The Model.
And so when Stan Lee and Jack Kirby created the Marvel Age of comics in 1961, there was no Marvel equivalent of Wonder Woman. There was no title that featured a female protagonist. Each group of heroes got one female member and that was it. And I'm sure the only reason Stan put a girl in each group was to raise the tension level. It added to the drama. The boys were always fighting over the lone girl in the group. Reed and Namor slugged it out over Sue, all the boy X-Men fought over Jean, and on it went.
The FF had Sue, the X-Men had Jean, the Avengers had Jan and later Wanda, The Inhumans had Medusa, SHIELD had the Countess, Sif was allowed to hang out with the Warriors Three and Balder, and I think that was pretty much it. Natasha was around back then but she started out as a commie spy. She didn't have a change of heart and become a hero until later, when she eventually joined SHIELD and the Avengers.
But that was at the beginning. The years and decades rolled on and times, mores and attitudes changed. There are a lot more women in the Marvel and DC Universes now. These days there are groups of heroes comprised of four or five females and one or two males. It took awhile but we got there.
True story: Stan Lee was kind of a progressive thinker for his day and age and he always wanted to see more female characters in the Marvel Universe, but he hated, hated, HATED female characters that were based on an existing male superhero. DC had Batgirl, Supergirl, Hawkgirl and Element Girl and Stan never liked that. He considered it lazy writing. He was all for more female superheroes but he wanted them to be original. He wanted the ladies to stand on their own and not be dependent on a male counterpart. I totally understood that and I agreed. That's why you should have seen the look on my face when Ms. Marvel, She-Hulk and Spider-Woman were released. I wasn't expecting that. I found out a few years later that the creation of those characters had more to do with protecting trademarks and copyrights than selling new comics, but that's neither here nor there. I'm glad all three of those characters came along because they've added a great deal to the Marvel Universe and I'm thankful for them, derivative or not.
Anyway, to sum all this up, if you were to ask me to name the 10 characters I think represented Marvel, they would surely all be straight white males. That's because when Marvel first launched their universe it was the early 1960's and straight white males were what we had. And that is when I first started reading comics. Cap, Thor, Iron Man, the FF ... those are the icons to me. If I had started reading comics 20 years later, I'm sure that list would be different.
I give Marvel credit. They've always been way ahead of their competition when it comes to diversity. They created the Black Panther, the Falcon, Luke Cage, Wyatt Wingfoot, Shang-Chi and the White Tiger to name a few. Nothstar was an openly gay superhero. And the first interracial kiss in mainstream comics history was in a Marvel comic. It was Amazing Adventures 31 in 1975. It was between Killraven and Carmilla.