The Kizarny character that debuted in a vignette on Friday’s Smackdown is played by Sinn Bowdee (a/k/a Nick Cvjetkovich), who has been working for the WWE developmental territory Florida Championship Wrestling. He is a Canadian wrestler who previously wrestled as "Sinn" in TNA. He was a member of the New Church in a tag team with Slash (a/k/a Wolfie D).
Bowdee has a legitimate carnival background. He worked as a member of a sideshow act for Carnival Diablo. He showed off those talents in TNA when he was featured as a "human dartboard" during a promo in which James Mitchell threw real darts at his back.