As for which characters it might add and when, it seems completely unpredictable who will get skins next Marvel Rivals and what they might be. MCU skins are perhaps the only costumes in the Marvel Rivals which seem inevitable as they are a well of endless inspiration that NetEase could draw from whenever its own great source of creativity wanes, but it has certainly proven beyond a shadow of a doubt that it is capable of producing remarkable skins – both faithfully and iteratively.
Many characters' default designs i Marvel Rivals have an interwoven explanation for why they might not be the spitting image of that icon, like Captain America's look that shows him as more of a stiff, futuristic action figure. Interestingly, the same creative liberties have also been taken with comic book-inspired costumes such as Jeff's Incognito Dolphin, Magik's Eldritch Armor, and Spider-Man's Bag-Man Beyond. Now that the Fantastic Four are starting to make their way in Marvel Rivalsit would be neat – if not redundant – for Spider-Man to get a traditional Bombastic Bag-Man costume with an extra bodysuit from the Fantastic Four rather than civilian clothes.
Family
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Why Marvel Rivals Spider-Man Bag-Man Beyond Skin is worth complaining about
Spider-Man's Bombastic Bag-Man costume is easily one of his most instantly recognizable with an equally iconic history behind it. Having just been separated from the black suit—which he eventually found out was an alien substance and got rid of with the help of the Fantastic Four—Peter Parker dons a paper bag with eyeholes cut out like a mask and an old fantastic four suit without shoes as a makeshift suit.
The finishing touch to this suit's design (or lack thereof) is that, unbeknownst to Peter, Johnny Storm slaps a “Kick Me” sign on the back. Of course, while certainly nostalgic and instantly recognizable, the Bag-Man outfit that appears in Marvel Rivals has his own look with Peter instead wearing baggy blue cargo pants, a red Empire State University hooded sweatshirt, and a half-moon bag.
Marvel Rivals' The Bag-Man Beyond costume is actually inspired by The Amazing Spider-Man #87 (2018) and not The Amazing Spider-Man #258 (1984), which explains why Peter's choice of clothing is different while still not being a one-to-one representation between its comic and in-game aesthetics.
To be clear, Bag-Man Beyond is a phenomenal Spider-Man skin in Marvel Rivals. The stylish modern take on what has normally been a costume born out of humor gives the volatile Bag-Man persona plenty of charisma while retaining Spider-Man's red and blue color palette.
It's therefore just disappointing that it bears no resemblance to the original Bag-Man suit and has no touch of the Fantastic Four's craftsmanship now that Marvel's first family has been officially revealed. Mr. Fantastic and Invisible Woman are now playable characters in Marvel Rivals starting with the launch of Season 1, Eternal Night Falls, with Thing and Human Torch coming later in a mid-season update.
Unfortunately, it's unlikely that another lunch bag mask would follow Bag-Man Beyond as that would mean two Spider-Man costumes would already be dedicated to Bag-Man looks. The only reason this might be acceptable is though Marvel RivalsFantastic Four has a uniform white-blue design that is coherent between Mr. Fantastic, Invisible Woman, Thing, and Human Torch, and it would be special to see the same costume on Spider-Man so that the Bombastic Bag-Man aesthetic can be immersive and canon to the game's universe.
There is another chance that Spider-Man could get a Future Foundation skin that is hopefully congruent with the skins given to the Fantastic Four. But in the meantime, it seems reasonable to assume that Marvel Rivals' Spider-Man won't be slipping into a spandex white-and-blue suit with a '4' sign on it anytime soon, if ever.