Blue Moon shares his design, mane and eye colors, compass rose cutie mark, and vest design and partly or completely color scheme with "South Pole", shares his design, eye color, stars cutie mark design and sometimes color scheme, and vest design and partly or completely color scheme with "Star Dream / Sky Dream", shares his eye color and sometimes design with "Chocolate Sun", and shares his compass rose cutie mark with Léon, usually Prince Blueblood, and in some material Friends Forever 13 Unnamed Stallion - Doctor.