William Peter Hjelte, better known by his gamertag Leffen, is a Swedish professional fighting game player and streamer. Although mostly known as a Super Smash Bros. Melee player, he has also competed in Dragon Ball FighterZ, Guilty Gear Strive, and Super Smash Bros. Ultimate. In Melee, Hjelte plays the character Fox, and is considered one of the best players in the world, having been ranked as one of the top seven Melee players in the world every year since 2014. A 2021 list compiled by PGstats ranked Hjelte as the sixth greatest Melee player of all time.