Pest X-san is a character from the anime series 'Ichigeki Sacchu!! HoiHoi-san'. In this futuristic world, Pest X-san is a combat robot designed to exterminate pests, similar to the protagonist HoiHoi-san. Unlike HoiHoi-san, Pest X-san is portrayed as a more advanced model with enhanced features, often seen as a rival to the main character. Despite being rivals, the interactions between Pest X-san and HoiHoi-san add a humorous and engaging dynamic to the series, highlighting the quirks and challenges of robotic pest control.