So this sorta came to mind with the recent Digimon Profile on Legend-Arms. Seeing as their whole gimmick is having a weapon form, could there be a potentially suitable Digimon to wield said weapons? And if not, could you see their weapon forms ever appearing in the Reference Book? I mean, I doubt the Dorulu Cannon or the Jet Sparrow would've been included at all if Shoutmon wasn't there to equip them (and I previously suggested Grani and Behemoth getting paired with Dukemon and Beelzebumon for profiles like this). Though, maybe they could pull a Splashmon and just give them multiple images for the same profile. Still, if they did that, the weapon forms would be hard-pressed to appear in any other media, seeing as most of the games and especially the V-pets don't usually allow for an equipment system (least of all one that's visually represented).
I guess for what it's worth, Durandamon and Bryweludramon do get to have their weapon forms wielded by RagnaLordmon. And Spadamon's spear form is used by ShoutmonX4S and ShoutmonX5S (though they're yet more instances of game Digimon who have yet to appear in the Reference Book). However, that still leaves the lower forms of the Zubamon and Ludomon lines. Also, Dynasmon was said to have wielded Armamon, though we never actually get to see Dynasmon equipped with it.
Most often the Digimon who gets forgotten are those who appear only in one media such as comics and videogames. Although they are not Digimons I would not mind seeing the eaters in other media. Yes, even that one with the questionable design
I wonder if it's possible for Eater Eve (and Eater Legion, for that matter) to exist without having the human bondage incorporated into their designs. Honestly, I didn't even notice Yuuko when I first saw images of Eve, making it just seem like some kind of basic spider-like creature.