I've never done a book like this but whatever....SCREW IT. Literally what the title says. I'll put some info on how I rp this fandom and if you're interested just comment or message me. I know Subnautica doesn't really have a large fandom, but it's...
Dominant Form Order: Merman, Semi-Creature, and Creature(rarely)
Name: Levi (I know other people have called them this, but to be honest it's really the most convenient name for any of the Leviathans. But if you are going to make a big stink about it, or if your character just has the same name, I'm ok with changing it to the Nickname)
Nickname: Reaper\Reap(by my character)
Age: 23
Gender: Male
Sexuality: Straight
Relationship Role: Definitely Dominant
Lenght\Height: Creature Form, 180 feet. Semi-Creature form, 25-50 feet. Merman Form, 10 feet with tail and if you exclude the extra tail length and look at him as a human he'd be around 6 feet, maybe a bit taller
Crush: Elizabeth(My character)
Personality: He is the "bad boy" type of person. He's strong, tough, and can be extremely violent. Definitely a Tsundere but also has the obsessive\possessive side of a Yandere and can get jealous easily. If he ever ends up loving someone, he can be a flirty\seductive person, but not all the time. He is extremely protective over what he cares about and will go ballistic if something happens to the few people he cares about, so lord have mercy on whoever it was that hurt the people he cares about. He has a soft side, but rarely ever shows it.
Attitude: Somewhere between Agressive and Defensive but is definitely more on the Aggressive side
Looks: Merman: Tail looks exactly like a normal Reaper Leviathan. Has pale skin. Green eyes that turn black when pissed off. Straight, chestnut brown hair with "little-mermaid-ariel-red" highlights that's shoulder length and long enough to be put in a small pony tail. His teeth are kinda sharp, not like a human's but not shark teeth sharp, somewhere in between. Semi-Creature: I don't own the picture. Design belongs to the original artist. I'm just too lazy to come up with my own design, so here:
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Creature: A regular Reaper Leviathan
Backstory: He grew up without a family and was pretty much on his own from the start. He always made sure that other creatures left him alone, since he didn't really want to form any type of relationships with anyone, feeling having friends would make him weak. Ever since the first ship with humans on it ended up on 4546B, he always scared away and sometimes even killed humans who went into his territory. He always hated humans because he thought they were cruel and heartless based off of the ones that had crashed on 4546B and what they did. But, he's just never met\seen a human with a kind heart that cares deeply about caring for animals and wildlife. And the Aurora just so happened to crash land in his territory.
Hobbies\Interests: He really enjoys messing with other creatures and scaring the living sh*t out of them. Sometimes he'll move around on the sand like a snake on land to make the sand come up in clouds. It's just something he enjoys doing for whatever reason. He also swims through the Kelp Forest to find creatures and freak them out. The Kelp Forest can kind of be like a maze in a way.
Extra: He is a Carnivore on the outside, so he will eat other creatures. But, he secretly is an Omnivore but rarely eats anything other than meat. He doesn't need to eat that often, though. Kinda like a shark, they can survive for a few weeks without eating. Extra: He has a cave on the bottom of the island my character lands near that's basically his "house" and if a creature or other living thing passes by, sometimes he'll lung out at them and either scare them or kill them depending on his mood and whatever it is that passed by.