His name is just Io, and he is a Changeling Druid/Ranger. Io was born artificially, from a Druid cult called “The Portal”, using the base of another changeling called “The Father”, basically in a form of scientific necromancy to avoid the illegalities of using it magically.
Io was taught by the Portal how to transform, because Druids can wildshape and Changelings naturally can change their forms however they see fit, given they’ve seen their target form before. For Io, he was raised into an assassin, and takes down the Portal’s enemies as they direct him. Io, rather than choose the forms of animals or people, has a fondness for insects and therefor deals out his missions by turning into a variety of insects, namely ones such as the Kepito spider, the white morpho butterfly, the dead leaf mantis, the gigas millipede, and the Common housefly, among others.
Quiet and efficient, Io can only speak Druidic, which makes his attempts to take human forms for trickery difficult, as it blows his cover once he is asked questions in his disguise; druidic is a secret language few know and understand.
He doesn’t really make facial expressions, he has large eyes with dark lids, and he doesn’t have any eyebrows
The thing between io’s Arms is an excess membrane that shielded him when he was created, and it’s fused to his sides like webbing
Despite being unemotional and cold, he has a soft spot for insects and is more agreeable and friendly when he can share in them