Windy seems to be an Ignis who likes to troll, pull pranks on others, and be carefree. He also appears to be the most distrustful with humans, meaning he is the most cynical when it comes to thinking humans are worth their trust.

Spoiler

It is later revealed that Windy is staunchly against humans and has been working with Lightning to overthrow humanity. He shows his true colors as a manipulative and deceptive Ignis, even willing to reprogram Ai to serve his own ends. He caused an accident on his own human partner simply under the rationale of "not needing him (his human partner)" his dislike towards humanity is to the point where he prefers the Ignis language and doesn't even consider himself human despite his free will and knowing Dr. Kogami's purpose in creating the Ignis