From the manga "Kiseiju" (also known as "Parasyte"), here's a wonderfully posable Super Action Statue version of the hero, Shinichi Izumi! He stands about 16cm tall, and he comes with a transformed arm and attachments for it, several extra hands (including ones partly transformed into MIgi) as well as a staff. And of course don't forget Migi--he's along for the fun too! He stands about 4cm tall.
A stand is also included.
Super Action Statue Shinichi Izumi & Migi