Hmm, I'm staying with what I had, but with a new twist, the original concept is going to be a juvenile. Basically a nymph, and needs to be powered up with radiation in order to be come in adult. And they do attack like fire ants.
Vishnu is the name of a Hindu God. If you speculated the monster's name as Vishnu from the teaser trailer..its wrong...because Oppenheimer is remembering the verse from Bhagawat gita were Vishnu takes the multi armed form..i.e. Vishnu The God is taking his universal form....so the monster is just a Muto and its name is not Vishnu......
Please refer the image of Lord Vishnu's multi armed form
These dudes and dudettes are DEFINITELY going to act as a swarm-type force! Also,I'm pretty sure these little big buggers are gonna be the only mutants that the American army can reliably kill,seeing as how Godzilla and the inevitable big bad are going to duke it out themselves with the military serving as a mere annoyance.