These three are upcoming antagonists for a planned Sonic fic, an alternate universe where Eggman turns out to be a good guy, but painted as a bad guy. In the mean time other villains use the distraction to build their own empire...and one of those major vilains are the Technosirens.
True to their name they can use their singing voice to control technology, like Magitek channeled through a voice. Though they can't control organics they can at least plant suggestions in the mind, like making them act more violent or unknowingly play in thier hands. Each of them are also technological geniuses in their own right.
It took three tries to get the designs right...or at least fitting. Yes, all three are insects.
MAGENTA THE DRAGONFLY
Oldest sister, the leader of the trio. At a young age she realized her status as a prodigy and studied hard to be the best, which she succeeded at. However, her intelligence came with a superiority complex, ego and sense of vanity and eventually came to believe only she woudl be smart and skilled enough to create a perfect order in a wretched world like Mobius, and she and her nearly equally gifted sisters set out for conquest.
Magenta, as mentioned is incredibly vain and arrogant, refusing to believe anyone is smarter then her and doesn't hide it when she thinks someone is stuipd and says it outright in their face. Though she has the actual intelligence to back up her claims, being a master strategist and designer of war machines. In combat she isn't defenseless as she is versed in a full-body fighting style and is very acrobatic in the sky. Despite sometimes insulting her sisters, she cares deeply for them and at times showed a softer side around them.
AMARILL THE CRICKET
Youngest sister, while has the same powers as her sisters and she is also a tech whiz in her own right, she is a ditz and an airheada, often walking with her head in the clouds and being easily distracted. She seems to be blissfully unaware when her sisters insult her and is always cheerful and peppy and wants to cheer up her sisters when they're mad or down.
Despite her airheadedness, she is the best mechanic of the three, Magenta doing the designing while she does the building. She also uses a very weird Drunken-Fist esque fighting style ideal for catching foes off guard. But despite going through all this to please her big sister, Amarill would rather spend her days cooking. She has a big sweet tooth and mostly makes sweets for her sisters, despite always forgetting that her sisters don't like sweets (but often eat them anyways to not hurt her feelings).
CYAN THE WATER STRIDER
The middle child, she is as she claims herself, never happy. She always makes a bored impression with her gravely voice and monotone. She herself is aware of her condition and is sometimes seen doing random stuff in a hope she could make herself feel any other emotion then sorrow. She often makes sarcastic comments and butts heads with her sisters a lot, but cares a lot for them.
Out of the three, she is the best pilots, often putting mechas to the tests Magenta designed and Amarill built. She also has a pair of jet skates which allow her to skate fast enough to cross water (true to her species) but her speed still is inferior to that of the likes of Sonic and Shadow. Her fighting style is blended perfectly with her skating skills, creating her own martial arts which uses strong kick attacks and skating tricks.
I went for a bug theme because there aren't enough intervebrate Mobians, not to mentions I have to gained a knack for them. They are named after the three primary colors Cyan, Magenta and Yellow (Amarillo in Spanish, from which Amarill's name is derived). Their outfits seem to be altered versions of the Dar Egg Legion uniforms, but differed enough to stand out on their own (hopefully).