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Ok, so.
Blob ghosts are like ecto filters. And there are some fics where ghosts just...roost and lay eggs or whatever. Biology says: now you have babies. But the babies aren't always the same level of intelligence.
But if you share ecto during this time or whatever... I mean, look at Box Lunch!
So Danny's little ghost babies need a little extra, because their Mama is part human. This Wayne Enterprises contest helped him find a way to stabilize his babies with Real World materials AND fulfill the Protect obsession they inherited from Danny.
The animal designs for the Fenbots? Those are the bodies his babies wanted. The mass produced filters? Blob ghosts really like their job. (Also, some fics say blob ghosts are gossips. This and Technus, is the communication system for the Fenbots.)
Ghosts hear about what Danny is doing for his babies and go, huh. Can you help with mine?
Danny quickly becomes a ghost doctor specializing in identifying obsessions. Some Fenbots have multiple Littles to balance Obsessions. Some merge together and work better for it. This also happens, naturally and willingly, when people start pack bonding them.
The little ones are flexible for a while and Danny's are at least a little more present in a way others aren't. So they more easily bond back and have favorites.
So that Sea Dragon that didn't make it? Was Danny's baby. Maybe bonded with one of Princess Dora's. And while the Core Protection System worked, that body is gone. So of course he held a funeral. (And if that town got a ghost dragon that spent as much time checking in on the kids and turtles it protected as swimming in the sea like it used to, well. No one's complaining.) (If there's sometimes an extra dragon, no one says anything. Just local legends to tell tourists.) (The Atlantians know and invite it down to visit sometimes.)
Maybe Danny has babies like normal ghosts. Maybe giving his blood/ectoplasm to the machines is enough. And the more they are acknowledged and loved by people, the more they grow.
Danny, after his parents turned from Ghost hunting to being the first official Ghost Anthropologists, decided to repurpose some of their weapons.
And, well, there was a contest being run by Wayne Enterprises; whoever can design a robot that will help the environment got prize money and a grant.
Danny, in all his mechanical engineering prowess, was bored. So he designed a thing. Repurposed the Fenton Guns into a cute robotic tortoise that would clean the beach.
It spiraled from there, and now Fenton Works is the leading name in green technology that's cleaning up the Earth bit by bit. Sea Dragon robots that clean oil and trash from the ocean; beach tortoises that clean the sand and beach and deposit their hoard of trash into designated receptacles that Danny uses as material to make more robots; Cryptid "stalker" robots with long legs that delicately patrol forests to perform "fuel management" and clear out the underbrush to help manage wildfires; moving gargoyle robots that sit on top of skyscrapers to help clean the air with huge sail-like wings, etc.
Basically, Danny pulls a Doctor Elisabet Sobeck, but with less world ending and more actually helping. (Not that the world ending was Elisabet's fault, of course, but different franchise)
And due to the number of times aliens try to attack and rogues send their own robots to attack people, naturally Danny installed self-defense protocols, along with one single golden rule written into the very OS of every single robot; Save Humans Whatever the Cost.
Problem is, Batman has never seen robots like this not be used for evil purposes, and he knows that their power source (a closely guarded Fenton Works secret) is some sort of liquid that glows green.
He really only knows of one liquid that glows green.
So he's determined to find everything he can about Fenton Works, because there's no way that Daniel Fenton isn't actually a villain in the making.
Danny's just thrilled for the chance to work with Wayne Enterprises.