DIAMOND SELECT TOYS. Who is the Last Ronin? The last surviving member of the Teenage Mutant Ninja Turtles is shrouded in mystery, but now he's the first-ever TMNT Gallery Diorama. Measuring approximately 10 inches tall, this dynamic sculpture depicts the Ronin running across a rocky landscape. Crafted of high-quality PVC, this diorama comes packaged in a full color window box. Designed and sculpted by Kinetic Underground.