Kaiju Jaeger Hybrids were weapons created by Newton Geizler. The first was Obsidian Fury, and the others were Drone Jaegers and the big Mega-Kaiju that were transformed by Newton.
Biology/Feautures
The kaiju brains in the drones were shown to be able to override the computers at command, and, at that point, some armor would be shed in favor of Kaiju flesh.