Marvel Rivals has recently introduced the Fantastic Four to its roster, and like the other heroes and villains, they’ve received designs meant to capture the spirits of the characters while giving them a modern game-oriented feel. Among them is the Invisible Woman, and thanks to the game’s behind-the-back camera, one thing is clear: Susan Storm-Richards has quite a butt.

Big buttocks and thick thighs are popular these days, so this isn’t particularly surprising in and of itself. However, the fact that they would give Sue a body in that direction makes me realize something: Perhaps no other character in superhero comics more thoroughly reflects the evolution of trends in female beauty standards than the Invisible Woman.

In my look at VTuber Takanashi Kiara’s 1980s-inspired aerobics outfit, I mentioned that its emphasis on a more voluptuous lower body does not match the dominant thin aesthetic that existed back then. The Invisible Woman goes back even further in time, to the introduction of The Fantastic Four in 1961. And while she’s not alone in that regard (there are female heroes who have been around far longer than her), the difference is that Susan has very few specific iconic features that define how she’s “supposed” to look.

The Invisible Woman is meant to be very attractive (enough that Namor is constantly infatuated with her), but not to the extent of a manslayer like the Enchantress. Other than being blonde, she’s not associated with specific physical features, like Power Girl and her large chest or She-Hulk and her muscular green physique. Her costume isn’t particularly iconic or defining, like with Supergirl or Psylocke. And her powers are actually less conducive to establishing her visual identity compared to most others, including her teammates—”stretchy with graying temples,” “man entirely on fire,” and “big rock guy” are instantly identifiable in a way Sue isn’t.

So over the course of six decades, Sue’s look has changed over and over. Her hairstyles have included long, short, straight, curly, simple, coiffed, Mary Tyler Moore, mullet, and everything in between. Her costumes have ranged from conservative to astoundingly daring: form-fitting, skin-tight, that famous design from the 1990s with the cleavage-exposing “4” on her chest. While she’s generally thin, fairly busty, and pretty, her proportions have all fluctuated a bit. To some extent, this can be chalked up to individual artists’ tastes, but I think it’s notable that they can play around this much with her design compared to other female superheroes.

In the context of Marvel Rivals, the Invisible Woman seems to be influenced by two factors aside from “big butts are in.” First, there’s Sue’s status in the Marvel Universe as a kind of matron of superheroes due to her age and experience. Second, Marvel Rivals is clearly trying to be the next Overwatch, and that includes its reputation for sexy characters who are arguably more famous than the games themselves. In other words, the Invisible Woman is very 21st-century MILF-coded, not unlike Elastigirl from The Incredibles—a series that itself clearly draws a lot of inspiration from the Fantastic Four.

If the Invisible Woman is getting attention again in ten years’ time, I wonder how she’ll look then.