KyuruKyuruten, also known as the Culculten, are a species of toad-like parasitic monsters that appear in the anime series Kamen Rider BLACK RX. These creatures originate from the Crisis Empire and serve as minor monstrous antagonists. Their background is that of invasive parasites designed to propagate their kind by using human beings as hosts. They thrive in warm environments and are notably vulnerable to cold, a weakness that proves significant in their encounters. In terms of personality and motivations, KyuruKyuruten operate on a basic instinct to reproduce and expand their numbers. They do not display individual personalities or complex reasoning; their actions are driven by the biological imperative to find warm locations, lay eggs, and secure hosts for their offspring. They work together in small groups, coordinating their attacks to overwhelm prey. Their role in the story is that of a threat encountered early in the series, specifically in episode six. They are sent by the Crisis Empire to attack humans and increase their population, serving as a direct challenge for the hero to overcome. Their main objective is to infiltrate human society and use the warmth of human homes to incubate their eggs, but their plan is thwarted by the protagonist and his allies. Key relationships center on their interaction with the character Shigeru Sahara, who initially befriends one of them out of curiosity and a desire to play, unaware of its true nature. This relationship highlights the deceptive appearance of the KyuruKyuruten and the danger of trusting seemingly harmless creatures. The monsters also have a direct antagonistic relationship with Kamen Rider BLACK RX, who ultimately destroys all three individuals. In terms of development, the KyuruKyuruten do not undergo personal growth or change. They remain consistent in their parasitic behavior from introduction to defeat. Their significance lies in the thematic lesson they provide about true courage, as Shigeru learns to stand up against them despite his fear. Notable abilities include powerful jumping legs that allow them to leap great distances and attack from the air, as well as the capacity to work together in coordinated group attacks. Their most defining ability is to spew a yellow foam from their mouths. This foam induces a dangerously high fever in human victims, weakening them so that the KyuruKyuruten can lay eggs inside their bodies. The eggs then develop using the host as an incubator, and the newborn parasites eventually burst out from within, killing the host. Their primary weakness is their sensitivity to cold, which can drive them away and render them vulnerable in battle. They are ultimately defeated by Kamen Rider BLACK RX using his Revolcane weapon, which destroys all three individuals in a single attack.