A couple dollars isn't much to pay for in-depth skin customization, but you can't spend your existing Units on the new feature.

To customise skins, you need to find an applicable costume in either the hero gallery or the store, and click the new customise button above the usual acquire or equip option. Then you just need to select an alternate colour palette, purchase it using a new premium currency called unstable molecules, and equip it.

Interestingly, the comic’s official description also confirms that it will feature “designs for new costumes coming soon to the Marvel Rivals.” This, in turn, confirms that Marvel Rivals is officially getting summer-themed swimsuit skins, and players can get a first look at them via the comic’s preview art.