Toxic Seahorse is a minor antagonist from Megaman X3. He is a Reploid modeled after a seahorse and serves in the Maverick army under Dr. Doppler, ordered by him to restrict human access to a large dam to starve them of water. He was also created uniquely with a special metal body that can liquefy.

His form while modeled after a seahorse is tall and has flexible limbs with a humanoid posture. His robotic body is mostly shades of green and yellow with sections of his torso, waist and head being rounded including his neck and curled tail. His arm and leg armor are elongated and bloom outward by the wrists and ankles. His feet are fashioned like suction cup digits. His head is small and rounded with his mouth being formed like a long snout with a vent at the end and along his neck are some pronounced purple scales.

His notable traits is his liquid metal body, able to freely liquefy and solidify at will. Along with it he makes use of spraying forms of acid even as clusters with Acid Burst. When in liquid form he's nearly untouchable.