There's actually a game that allows you to play as abyssal shipgirls.
https://youtu.be/hfZUQ17MeKsTo sum it up.
>In this world, a massive devastating war occurred, causing the sea to be dangerous for humans to travel. To counter this, dolls (like GFL) shipgirls are invented and they can travel on the sea to replace humans. However, some shipgirls gained sentience overtime and transformed.>And humans, being assholes, seeing that our once obedient tools no longer obedient, mobilizes army against these rogues. You are a newly recruited commander by some secret organization, tasked to lead and ensure the survival of these shipgirls>Gameplay consists of acquiring shipgirls and leveling them up. When they reach a certain level, you can remodel them into abyssals. 
