Variants Sets/Keyword + Homage Field
Adding the Option to Connect variants to be a set.
Marvel have been doing variant sets on monthly basis at this point (Timeless, Stormbreakers sets, Planet of the Apes and so on)
A great feature for collectors and completions would be to view all the variant set in one place. Think of it as a clickable button that will lead to that menu. Currently, community members use community lists and external guides to get this info and to subside the lack of a set feature. As a collector myself that had to use an external guide to find all the Timeless variants, this would help a ton.
The same menu can be used for another feature that I think would be cool: Homage field for variants and covers! It will be another pressable field that would say the original issue name that when you click on it would show all the variants and covers that homage that original Cover. Again, the lack of this feature have been subsided using community lists. I don't believe any other site have this features, and it will be a LOCG first to have and great for collectors as well.