Meroune Lorelei

Meroune Lorelei (メロウヌ・ローレライ, Merōnu Rōrerai), or Mero (メロ) for short, is a mermaid bound to a wheelchair. While she is the fourth girl to officially move in with Kimihito, she is technically the fifth girl to move in with him (after Suu). Her full name is "Meroune Lorelei Du Neptune".