These are the various relationships Meroune Lorelei has or had over the series.
Mero first meets Kimihito after he saves her after Mero looses control of her wheelchair going down a hill. She later joins the Kurusu household and have a strong desire to become Kimihito's mistress and wants to be in a tragic relationship with him. Her will to have a tragic relationship also causes Kimihito to drown. After the events at the Mermaid Kingdom, Mero ditches the idea of being Kimihito's mistress, wanting to be his wife instead.