I used a Gusty G1 My little pony and kept the original MLP hair. MLP Unicorns always come with a different colored streak of hair, hence the hot pink streak in She-Hulk. The MLPs I use in these customs are used and played with, so I have given them a full bath, shampoo and condition and brush and curl their hair, and scrub them inside and out! No rust/mold problems!
Simple full-body paint job, including eyes.