Deleted member 108228
First of all Hybrids are made from remains of fallen human and shipgirls, reanimated and twisted by the Symbiotes. the latter usually are made into a slightly more powerful version of their former selves.
Hybrids that not a mindless hivemind drones are varied. Most are just innocents who happened to be persecuted a lot by other humans for being a hybrid, some turned to 'sell' their conscious to the symbiotes and become one with them others just become an Anti-Human terrorist group that want to spread Symbiotes' mutagen to the populations. Few Hybrids actually served in the Navy and become the Admiral for the shipgirls, one of them is a young German officer named Alfred Rosenberg (happened to have the same name as the Nazi one), he was originally a human but got abducted once and barely turned into a mindless hybrid in the reefhives before he managed to escape. He's being kept in charge because of his knowledge about the deep sea enemies under circumstances that he must hide his 'infected' part of his body.
Also as for the Abyssal/Sirens detached from their hive mind, most of them become mindless feral beasts that wander the sea and occasionally eat sea life ranging from plankton to a small whale. The more 'humanoid' form are start to get their own consciousness but still believe they are part of their forces and retained their aggressiveness.
Can they reproduce? How many are there? 1 million? 10 million?