Shampoo has quite a bit in common with both Lynn Minmay and Li Meiling. Apart from initials. Ranka too, but she doesn't fit the hairstyle pattern that unites the other three.
Most importantly though... they're all just a bunch of cute characters who I wanted to draw.
(Rankia and Minmay belong to Studio Nue, Shampoo to Takahashi Rumiko, Meiling to CLAMP/Madhouse)