This is a great teachable moment.
Anytime you think of what is "typical" for a race (haughty, but refined Elves, brusque, Scottish-accent Dwarves, dumb Cockney-accent orcs, smelly, stupid Goblins), you're thinking of writing With-Type, which is to say following the common stereotypes, many of these having been thought up by the great writers of our past (Tolkien being the example for Elves and Dwarves).
I tend to write Against-Type. I will write a race or species with SOME of the typical characteristics you would expect, but I also throw in a few curveballs that make my version of said race or species unique. Remember that World's Crossing Academy is also about the monster girls trying to acclimate to human culture. There are many Goblins on their native world that can be exactly as you say; ugly, warty, smelly, and stupid. They DO exist. But most of the Goblins you've met thus far have learned things like hygiene and manners while pursuing their desire to live on or at least be able to visit the human world and keep to our customs and standards.
Galka is another great example. She's huge and strong, but she's not dumb and aggressive, like a Goliath probably should be if written With-Type. She's actually quite deep and emotionally intelligent, and acts rather motherly, hoping to solve problems from the inside out rather than just smashing anything that disagrees with her.
The other thing is, my mission in creating the Goblins was to try to take a race that was typically considered disgusting and unattractive and figure out a way to make them cute. I didn't make them look human on purpose; I kept the hooked nose, the smushed chin, the broad, pointed ears, and the inhumanly colored, slit irises. The rest, I tried to soften out a bit. So we have enough traditional Goblin features to be believable, and enough of my own invention to make them feel fresh.
Also, you must not be a fan of Harry Potter. You should also balk at the Goblins at Gringotts being intelligent enough to run a fairly substantial business.
Anyways, you'll find With-Type and Against-Type examples of a lot of races and species in lots of popular media. I happen to be a very Against-Type writer, and I always try to throw in surprises with each character, something that subverts a reader or player's expectations. Enough With-Type to feel familiar, enough Against-Type for it to feel new and fresh.
And if I may say, this game has been out over a year and a half, and through thousands of entries on my feedback forms, 51 pages in this forum, hundreds of rating on Itch, and an entire Discord community around the game... you are the ONLY complaint I've ever heard about the Goblins. I will not be dumbing them down or changing them anytime soon