Grebber grew up in the somewhat famous coke ovens, also colloquially known as fairy caves, of Oswaldtwistle. Despite this, they decided to move to the US and start travelling around later in life. It wasn't exactly like they hated their home, in fact it was quite pleasant, it's just that Grebber has always been a free spirit and has never felt like they want to be tied down to one place all their life. This is what made them look towards the US of A, a huge country with a massive variety of locations to explore. And so Grebber decided to get a decently sized camper van with everything that they need (including a large collection or real doubloons scattered about that they always seem to lose) and start travelling around to wherever took their fancy.
Most of Grebber's money comes from things they find lying on the ground, Whether that be doubloons in their van or just items strewn about on the street (or in someone's yard, what's the difference). Sometimes, once every so often though, Grebber will pick up an odd job or two if they believe it comes from a reputable source. Grebber is an individual who lives life a day at a time and doesn't look too much into the long term and so most of their money will go towards having fun in the moment like binge drinking and partying or like spending money on petrol to go to wherever they feel at the time.
In life, Grebber's one main ambition is freedom. the freedom to travel, the freedom to have fun and the freedom to not be stuck doing one thing for too long. This is why Grebber couldn't accept the role of the Goblin King, a restrictive job with many responsibilities. While they still wouldn't kill or die to avoid this, they would do their best to sneakily slip out of this role. Luckily, while the goblin community seems to have a lot of respect for Grebber, they seem to have come to a mutual understanding that they're not one to be so easily tied down. Other than this, Grebber just really wants to have fun and hopes that they can pass off that fun to everyone around them. At the end of the day, they just want happiness for all who deserve it. The ones who don't can fuck off for real.