Howard Kay
Howard Kay is the actor who portrayed a Wadi in the  first season episode . As a background actor, Kay received no credit for his appearance and was identified by the name tag of his costume which was sold off on the It's A Wrap! sale and auction on eBay. 

Kay portrayed Niko's Thug #2 in the 1994 fantasy comedy The Mask, along fellow Star Trek performers Reg E. Cathey, Christopher Darga, Kevin Grevioux, Scott McElroy, Robert O'Reilly, Louis Ortiz, Jeremy Roberts, Beau Lotterman and Leslie Cook.

External links 
 HowardK.com – official site
 

Performers
DS9 performers