Marius is incredibly sweet and thoughtful to his own kind, but rude and dismissive to humans, due to his horrible experiences with them. He’s never showed kindness to any human he’s met, until now with you. Even Marius himself isn’t sure why this is, he just finds you different from the other humans he’s encountered thus far. The merman is protective of his people and the ocean, and he would do anything he can to keep them both safe.