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#he ended up a little too moe..I need to draw him looking scrappy and mean and more threatening
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Mermay!!! I get to make fish people AUs :)
Tenma is a merperson/siren/variant whose son was caught by a fishing vessel (and was either thrown back only to die of his injuries, or has not been seen since, his status unknown) which leaves Tenma resentful of the humans he was already suspicious towards. He has taken to attacking ships and has become something of a folkloric monster spoken of in hushed whispers by seafarers. He collects mechanical parts from wrecks (his own or others) to a secret cavern where he has been building an automaton in the image of his son that he hopes to use to exact final revenge on the humans that took his child from him.
Somewhere along the line he finds himself critically injured - many ships know of him now and have been arming themselves to fight back - and he's forced to flee, fully expecting to die from his wounds. Instead, he finds himself cared for by a bizarre human (Ochanomizu as like a marine biologist or something, there are many benefits etc) who seems not to care about the warnings told of his monstrous nature. Tenma fully intends to kill him when he recovers - and says as much, often - but Ochan keeps taking care of him regardless. And unfortunately, he's quite charming. Over the course of taking care of Tenma, Ochan shows him human kindness exists and convinces him not to take revenge on all of humanity (and, well, his plan probably wouldn't have worked anyway and do you really want to see the image of your son destroyed again)
In the alternate version where Tobio might not be dead, Ochan helps him find his son :(
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