Tohl Narita: “I applied the skin and color of the oniyanma to a kaiju.”
Oniyanma is the largest species of the dragonfly in Japan. That being said, I feel like it is quite hard to associate Dorako with the oniyanma as the kaiju makes it likely that some sculptural features were incorporated into it with its entire form and the tile-like texture so that they make the kaiju look more like a sculptural art work than a creature in my opinion.
While I totally admire Ryosaku Takayama, along with Narita’s design, for his work of sculpting the insect-like wings so excellently, as it was supposed to have its left hand shaped like a sickle and right hand like a tape measure, Takayama seems to have had a very hard time to sculpt the right hand to make the mechanism work.
As there is a weapon called “kusari-gama” (sickle and chain) often portrayed as a weapon to be used by the ninja in period dramas, the tape measure hand seems to be designed to give out a chain or something in combination with the sickle hand, or at least chances are that it was supposed to have the right hand with something like a whip that would roll out like the chameleon tongue.
At any rate, the tape measure hand was replaced by another sickle hand (probably on the set as the costume is found to have a sickle hand and tape measure hand when it was delivered to the Bisen studio) after all so that Dorako had sickles on both hands finally.
To prove this, the costume that actually appeared in the show had a slightly differently shaped sickle for each hand.