Category 2: What Effect Would One Monster Girl Species have by Combining With Any Other Monster
Moreso than the Tentacle, I think a lot more people would say that any monster girl can be improved by combining her with a holstaur. My favorite combination would probably be the Medustaur (Medusa-Holstaur). User TheReptileKing already has the holstlamia in their setting of the Reptile Kingdom, but I wanted to mention it anyway. Especially since MGE has 7 different snake girls, each being different enough and notable in their own right. But maybe be careful about combining the holstaur with any of them lolis. You just get a very upset little girl. 11 years old and enormous boobs. Or maybe she ends up 2 bodies fused vertically, one massive breast on one side and the more petit body on the other side. You have to hold her or she tips over.
Couple people have already mused, in some discussion thread I think, about what a queen slime variant of any other slime girl would look like. Queen Red Slime, Queen Dark Slime, Queen Nureonago, Queen Sea Slime, Queen Parasite Slime (I’ll take that one thanks) Queen Bubble Slime (Blech), Queen Humpty Egg (bigger blech) and Queen Shoggoth, which I recall being suggested as a shoggoth so big and powerful that she could take the shape of a house, furniture and all the other things inside that you’d need to live. I couldn’t find the person who suggested the queen shoggoth but it was fairly recent. Page 2.
You know what would be really terrifying? Combining some of the less popular monster girls, that are typically offset by low intelligence/mobility, with a species that is haughty, smart and incredibly mobile. How about the Dragon? The Giant Slug Dragon' is feared in forests worldwide. The Roper Dragon is especially frightening since you can’t even see the slimy covering until she’s on top of you. And fears of the spread of Dratango (Dragon-Matango) have been brought to the Demon Lord herself. “The Matango were fine but then someone had the idea to fuse one with a monster who’s smart and can fly”. But it’s not all bad! The primary Dragon species also has the effect of automatically making a monster fusion cooler. Like, name a monster girl that doesn’t become cooler by being part Dragon. How about the L'iving Dragon Armor or the Cursed Dragon Sword? Rockin’! Any of the Four Elementals (Ignis, Gnome, Sylph and Undine) can combine to make The Fire Dragon, Earth Dragon, Wind Dragon and Water Dragon respectively. Combination with our resident zappy girls makes the Lightning Dragon (Dragon-Thunderbird or Raiju) while retaining some features of the respective other girl that gave her lightning powers. Ice dragon (Dragon-Glacies/Ice Queen/Tsurara or Yuki Onna), I think dragons should have elemental variants anyway. On a side note, elementals (specifically the four I mentioned earlier which grant their husband their respective power) definitely give the resulting fusion the same elemental powers, and probably the same ability to like, merge with the man’s spirit or whatever it is they do.
The Cyclops unquestionably gives the resulting monster a single eye. Probably some smithing skills too. You could make a Bi-Clops (Cyclops-Bicorn). Iceclops (Cyclops-Ice monster girl). Ogreclops.
The potential 215-ish monster girl combinations that come from a Unicorn being crossed with any other non-unicorn are purely hypothetical, as upon being combined, she instantly becomes a bicorn hybrid. Similarly, if you try to combine any celestial (not really monsters I guess) valkyrie, angel, houri, with any of the dark versions or just demonic monster girls like dark valkyries/priest/angel, demon, etc. You just get a corrupted celestial monster girl fused with the demonic monster girl. Maybe you could fuse 2 specific celestials like a valkyrie and angel.
One of the most frightening monsters you could combine is the Devil Bug. So you have about 25 gfs, and somehow one more who’s not a devil bug. Upon fusing them, one of three outcomes is likely. 1. 25 devil bug hybrids, each bearing characteristics of the not-devil bug monster. 2.Your not-devil bug gf, who now has 6 legs, an exoskeleton and antenna, on top of whatever monster girl she already was. Her personality and perhaps even memories are gone. Oops. She’s a hive mind, 26 minds all in the same body, all interested in one thing. 3. perhaps the best outcome? Your not-devil bug gf, with the combined characteristics of her species plus the devil bug, even parts or most of her memories and personality. She does, however, want to make those babies as fast as possible.
The dryad seems like a good combo to me. Live in a tree surrounded by pretty bug girls (I also imagine it wouldn’t be that hard to leave). Any insect girl could combine with a dryad, retaining the ability to live in the tree. It just makes sense to me, since they’re so closely tied. But shouldn’t any monster girl fused with a dryad retain the ability to live and hide in a tree? Salamandryad, Lizardryad, Dragondryad, Demondryad (now we’re talking), Dryatoskr? Sandryad. I think most of these are clear which monster is fusing with a dryad, except for the last one. Sandworm-Dryad. But it’s purely hypothetical. There’s no way such a creature would make her way so far outside the desert region, let alone to a forest. Just try not to worry about wandering by some random tree when a fifty foot beast lunges out of a random tree and devours you. And on that note, there’s no way you’d ever have to worry about a Sandshark (Sandworm-Mershark), an enormous shark which can swim through the water just as easily as the ground, lunging out to swallow ships and spitting out most of the crew to the mercy of the other aquatic monsters. Just when you thought the worst thing to encounter was a kraken. Of course there’s 2 ladies on the inside of the sandshark, so it’s not as bad as being eaten by an actual shark. Frankly, I suspect most of the sandworm hybrids would just transplant the second monster girl inside the sandworm’s body.