So far we've seen a Kraken, a Megalodon and everyone is pretty sure that a Sea Serpent is on its way. I have a few ideas for after that. Mostly Asian in origin because as I said in a previous topic it's pretty overlooked, but for some their origins can be ambiguous and at least one is a European that has definitely been overlooked.
Nessie-Yes I know that she is supposed to be a lake monster but her true habitat would be the ocean. In fact there is a legend of sailors finding the remains of another of her species still rotting.
Giant Sea Turtle-Asian in origin but they probably aren't the only ones with this idea. See Avatar: TLA or that third Disney Aladdin movie for examples.
Shen-Magic Clam that causes hallucinations without even having to eat it.
Jin Chan-Cute name considering it's a three-legged bullfrog that guards treasure.
Jiaolong and Panlong-Two different types of Sea Dragons. Sea Serpents are in demand.
Water Monkey-Evil little **** that likes to drown people.
Kappa-Similar to Water Monkey but not as inherently evil and extremely polite regardless. Think Micheal Bay Turtles ugly minus the steroids.
Ningyo-So apparently it tastes good but also brings storms and bad luck. I'm just giving some ideas for SOT. Do what you will.
Namazu- Giant evil catfish. Starting to see why they get such a bad rep.
Ikuchi-Sea serpent that is so long it takes three hours to get around. Drowns ships and sailors in oil it secretes.
Sazae-Oni- T******e stealing Crustacean. What age range is this game rated for again?
Isonade- So there's already regular sharks and a Megalodon, but how about a giant shark with metal barbs? Seriously I'm just spitballing here.
Umi Bozu-Giant monk who appears at night to dump barrels of water into ships. Honestly this would be hilarious. If nothing else PLEASE add this one to the game.
