Mychal "trihex" Jefferson is a well known Yoshi's Island LPer. He is an American professional gamer and speedrunner. He is a very popular livestreamer, projected to reach 200,000 twitch followers within 2016.
Trihex has been speedrunning Yoshi's Island since 2004. He was one of the eight speedrunners drafted to compete in the Nintendo World Championships in 2015. Surviving the elimination matches, he, together with Narcissa Wright, Mad Mage and John Numbers, ended up in the semi-finals, where he lost in a match of Super Smash Bros. for Wii U while playing as Toon Link.