Dear, Vector Prime.
Was there a Cybertronian in Beast Wars that transforms into a butterfly?
Dear Lepidopteran Laconic,
I am reminded of the Predacon Balisong, who in one universe took the form of an immense Troides magellanus. She was a fierce rival of the Maximal Stiletto, and their duels were spectacular to observe—both aerial dogfights, and ground-based knife fights.
Another that comes to mind is Monko-chan, an Insectron warrior who turned into a Pieris rapae and was a devoted student of Bigmos. Unfortunately, the two drifted apart due to differences of philosophy. Even though both were devoted to peace, Monko-chan believed that peace would ultimately require sacrificing lives, while Bigmos believed that no true peace could come from violence. They parted ways not long after the battle for Dross.
I’m sure you’ll be charmed to learn that Cybertron has butterflies of its own! I recall the Maximal caterpillar, Hecatron. Her voracious appetite caused Botanica a great deal of trouble, and rather than destroy the Maximals’ technorganic orchard, Hecatron voluntarily entered meditative stasis lock. It wasn’t until after the planet’s reformatting that she completed her own transformation, emerging as an iron butterfly sporting gorgeous purple wings with striking green spots.
Oh- I almost forgot. The Decepticons had a butterfly scout named Siphon in their ranks, whose talent at spotting fuel sources from above proved to be just as effective in locating Autobot resistance cels. I wouldn’t be surprised if you haven’t heard of him—although, that said, he is one of the Insecticons involved in a curious case of trans-dimensional harmonic resonance, bearing an uncanny resemblance to mechanoids built by humans on Earth; in his case, the Beet-Papil robot.