From Sentinel. Sentinel's Kerounen series continues! This collaboration between Kow Yokoyama, the legendary creator of Maschinen Krieger, and soft vinyl artist Takeyama Noriya, brings us the Kerounen frog robot with his egg-shaped pilot! This soft vinyl action figure features carefully applied and subtle weathering, and movable arms. The pilot figure can board the Kerounen's head, too. Collect Kerounen Kenzou, Robozou, Fukuzou, and Raizou in an assortment of different colors and finishes!.