Pacific Rim Headcanon:
Kaiju reincarnate. The hive mind is useful for maintaining communication, but each kaiju clearly(and is confirmed by the director to) has its own consciousness and personality.
After they took out Trespasser, he came back later as Knifehead. After they took out Karloff, he came back in as the much stronger Hardship.
And Otachi and Leatherback? They’re not mere superweapons. They’re veterans who have seen to the conquering of countless worlds before. They’re also a couple, and Otachi’s baby was not planted there by the Masters. Mating is discouraged by the masters, as it only devotes useful biomass to unapproved, unrefined babies of pure chance, rather than the corporate-approved constructed bodies. But in recognition of their service, the two master assassins were given some measure of freedom.
After Newt drifted with the hive mind, however, it made waves. Creatures who were taught nothing but violence and conquest were exposed to new emotions, most notably curiosity.
The older veterans are not swayed by this: Especially those who hold grudges against the humans who killed them again and again. But new lives aren’t as hardened or set in their ways. When Otachi and Leatherback’s baby was added to the network, its programmed rage was pushed aside in favor of curiosity; Just what ARE these creatures they’re sent to exterminate?
When the infant is given a new, fully developed body and sent loose in the sequel, it will seek Newt out. It will force a drift upon him. And then it will indulge its curiosity: “Who are we?”