When you get displaced to a rather colourful world as a sociopathic ex-Yakuza who can control matter, you really don't have alot of jobs. Stuck as a cafe owner in a ponyland, read as he suffers because he doesn't know the social norm.
He was a ruler, an adored king to his subjects. Now he is a simple miner in the crystal caves of Canterlot with love that he hopes is not unrequited. He now goes by the name Umbrum but most could remember him by his old title, King Sombra.