Goblins are short, averaging about 4'2" in height. Some are skinny, some are fat. They're pretty much all over the place. Their skin is brown, hair and eyes are green or purple. They have excellent mechanical skill, but are utterly incapable of magic except through accident. They're also quite moody. They can switch into must build something mode and will work for days without food or water until whatever contraption they're building is finished. They're also pretty good at selling whatever it is they've built, and have a high affinity for the new and shiny.
My inspiration is somewhat based on Nitrine from Flaky Pastry