In "May the Best Stan Win", the boys find his sex doll which he allows them to take to remake the movie Mannequin.
Roger and Stan take their idea for "Male Stripper Shoes" to Mr. Yoshida to get funding for their idea in "National Treasure 4: Baby Franny: She's Doing Well: The Hole Story". He agrees to bankroll their idea on the condition that they kill his wife but they find they are unable to do it. They later spot an ad for their shoes and find he has stolen their idea.
Hideki becomes a "business partner" when Stan and Roger decide to market their "Piece of Cake" cake slicer in "Independent Movie" during his birthday party when he demonstrates his "gut instinct." However, as they celebrate their success, the trio's gut instinct results in the three of them pulling guns on each other as the screen goes black. As a shot is heard, Roger proclaims that Hideki was the one shot.
In "Fantasy Baseball", Toshi claims that Hideki once poisoned his soup.
Hideki Yoshida is voiced by Reggie Lee.