Sea creatures

In Greek and Cretan mythology, they could be depicted as either half-fish or fully human. They were incredibly strange. They didn't even live among other creatures. They were deep. But their children usually came here to play with other creatures.

They descend from the Greek water nymphs, who were the daughters or companions of the sea gods.
They were nervous and difficult to understand. Sometimes unbearable. It's best not to mess with them, otherwise you'll be caught in their screams.

Celtic, Germanic, and Scandinavian water spirits that can take many forms, from snake and dragon to human.
They loved all creatures of this people very much. They were always kind to everyone. They are worth being friends with; they are very sweet and gentle.

Octopus-men from Asian and Native American mythology. Vile and impossible. Arguing with them is very difficult. After all, they simply win every battle.

Nereids: A type of water nymph characterized by blue hair. Nereids are known for their kindness and are always helpful.

Sirens: mythical creatures in ancient Greek mythology, demonic beings whose upper body was male and lower body was that of a bird. They were terribly evil... They had hearts of stone. They did not love. They do not have these feelings... Although who knows. Maybe they do, but they are far away in the heart.
But this is an exception... only 1% of Sirens... can fall in love

Rusalki: a mythical creature in Slavic mythology, a spirit associated with bodies of water. They were both girls and boys. They were very kind and friendly, making them easy to befriend.