Duosion's inner body is pale green, with a large head that sports a mouth that looks like a red diamond and a cleft down to it, with an unconnected portion floating above the head inside the darker green gel. Duosion's torso is small, and its limbs are stubby. The gel has formed bulbous features at the lower sides, as well as above the floating pebble-like inner portion. The cleft down its head is presumably where the two brains are split.