- “In the name of the Mejiro family, I will fulfill this dream.”
- ―Mejiro McQueen
Mejiro McQueen (メジロマックイーン, Mejiro Makkuīn)  is a supporting character in Uma Musume: Pretty Derby.
She is the daughter of the Mejiro family – one of the most famous families in the equine girl world. She joined Team Spica due to Gold Ship's unbearable convincing. Her sisters are Mejiro Dober and Mejiro Ryan.
As one of the Mejiro family's pedigrees, she has a strong sense of pride though she is quite gullible and easily convinced. She may initially seemed a blunt and cold person, but she actually cares about others and will offer help when needed.
She is a petite horse girl with bright lavender hair, she has brown tips on her ears and a teal ribbon on her right one. Her eyes are violet and they have white highlights in the center. She consistently seemed to look worried.
- 世界は僕らの言いなりさ (Sekai Wa Bokura No Iinari Sa)
- Waiting for Tomorrow
- Umapyoi Densetsu
- She won the Emperor Award (天皇賞) like her mother and grandmother did before her.
- She secretly stays on a diet to maintain her body shape for her long distance races.