I'll try to explain why he is called/calls himself darkness. Around 2010 Fernando and a couple of his black friends began calling their crew darkness. Like the black crew within the crew. I think it was a qoute from a song or something that they thought was funny. At the same time a national skatepark competition series started in Sweden. If you were any good and black Fernando was like. "Yup, you are in darkness. Sort of like a joke but sort of serious too. So darkness was a well known crew in Sweden and Fernando was in the center of that. Hence darkness-Fernando. If I remember it correctly, he won that series the first year. I think Oski won the second year.
Last but not least a little Polar spoiler: the big bank that Fernando fs nosebluntslides, Oski does that backside in the Polar vid.