what do you like about those gobbos? Just want to hear if its something that I havent thought off.
I'm not the one you asked, but in my opinion it's the lack of a substantial size difference. Here, they look like disfigured humans/orcs rather than goblins. This is fine on its own but if you're going for goblins specifically it needs a different feel.
If I had to break it down into a few concepts:
1) Reversal of the size/power dynamic
Unlike orcs or other 'monster' races, goblins are typically shown to be weak and frail. Cannon fodder effectively. Where orcs and werewolves or hobgoblins or whatever can forcefully impose themselves on someone through sheer strength, beating a single goblin is fairly trivial in most settings, as they are in GS.
But either through cunning or sheer numbers, having them overpower people they shouldn't and take advantage of them is part of the appeal. This is especially true when talking about subjugating adventurer parties or other powerful characters. That, and people like an underdog. Or underdogs, in this case.
The difference in size also makes the positions they need to take different from regular monsters. Things like standing on their victims calves when doing it from behind, or having to force them down to 'their level' for example. Generally speaking, if you can replace them with regular humans and it still works, they could stand to be smaller.
2) Numbers
Building from the previous point, the horde mentality and group behavior typical in portrayals of goblins is part of the appeal vs other creatures. Swarming someone without care for taking turns and just
using any part of them that's available tickles people with this kink, not to mention the orgy-like nature of scenes including them with everyone getting a taste of every goblin there multiple times.
3) Social structure
They're even often depicted as barely sapient beings driven by low cunning and instinct, and only really function in groups the same way a flock of pidgins or seagulls do; happily stepping on each others heads to get what they want. Only rarely do they have a power structure beyond 'might makes right' and that makes it kind of interesting to see how they can loosely organize an attack and capture, only to then immediately lose that structure the moment their prey is in their grasp.
Very much a primitive vs civilized dynamic that's used for these kinds of monsters.