I really hope to marry Erevi. It's been hinted before, with her slowly falling in love with MC and she literally mentioned marriage.
Also she seems to be a noble, of house Istanath, so marrying someone powerful/important like MC makes sense in tradition.
She's also arguably the most important woman in the game and to the MC. She taught him and guided him through many things. MC would not become strong and make it far without her.