Leon is a French smasher who plays both Melee and Brawl. As he chose his nickname shortly after Brawl was released, most Melee players still know him as Nassim, his real name. He is currently ranked 7th on the French Power Rankings.
He surprised many players at Epita Smash Arena, his first tournament. While he was not aware of advanced techniques at the time, he had developed his own playstyle and combos with Roy, and managed to reach a decent place.
He originally mained Peach in Brawl, and was often referred as the French Brawl Champion, since he placed first in most of the Brawl tournaments in France in 2008 (and thus placed 1st in the 2008 Rankings) with her. Counting tournaments in anime conventions, Leon won 9 tournaments in 2008, 7 in a row, 3 being Bushido Impact events.
Leon frequently attended major tournaments in North America, such as SKTAR and the Apex tournament series, where he has achieved significant placings. He has taken sets off of top players such as DEHF. He moved to Ontario after Apex 2014, but moved back to France after 5 months. Leon was ranked at the 0 position on the Brawl Southern Ontario Power Rankings. He was formerly a member of the Bushido Impact staff starting in July 2009.
He still plays Project M, and is currently ranked 3rd on the French Project M Power Rankings.
In Ultimate, Leon plays Lucina, rather than his old Brawl main Marth, finding success via taking multiple sets off players such as Flow, Ogey, and PeW. His Lucina’s playstyle is known for its patient movement and spacing.