KOSSismoss is an SSBU King K. Rool main from Northern California currently residing in Washington. He was considered as the best King K. Rool player in the world very early on in Ultimate's metagame, notably being the first player to place well in tournaments with King K. Rool.
KOSSismoss was a Mr. Game & Watch main in Smash 4 who is regarded as the best Mr. Game and Watch player in the United States, and one of the best in the world alongside Regi and Maister. He has wins over notable players such as VoiD, Xzax, Sho, Ito, Trevonte, Cacogen, Konga, falln, and many more. KOSSismoss is currently ranked 7th on the Western Washington Smash 4 Power Rankings.