Most something be yellow on my Sonic fan character since there are something yellow on most of the Sonic characters, except Rouge and Sally, but least Rouge's skin is orange or tan and Sally's fur is orange and peach witch are least shades of yellow colors.
There are uncreative, similarities and expies between the Sonic characters.
Many of the characters have sock or ring hand or shoe cuffs, at least both Sonic and Tails wear hand and shoe sock cuffs, Amy, Shadow, Wave, Rouge in Riders outfit, Breezie in Archie Comics and Opal wear gold ring bracelets, both Tikal and Sally wear blue ring hand cuffs and at least both Amy and Sally wear almost same boots with same cuffs.
Both Sonic and Shadow have almost same spikey hairstyles, least different is four of Shadow's spikes bent up.
Tails, Shadow, Silver, Big and Jet have fuzzy fur/feather on their chests
Tails, Big and Pachacamac have fuzzy fur on their cheeks.
Both Blaze and Big are purple cats.
Rouge, Wave, Vanilla and Opal's eyes are half-open.
Blaze, Tikal and Lupe in Archie comics wearing gold collar necklaces.
Both Amy and Silver wearing boots with same one stripes and at least both Amy and Mina wear same boots with same one stripes.
Both Sonic and Blaze have same one white stripes on their shoes.
Both Sally and Antoine wear same boots, except in different colors.
Both Tails and Amy have almost same similar bangs.
Blaze, Rouge and Vanilla wear high-heeled shoes.
Both Cream and Vanilla wear same hand cuffs.
Both Blaze and Tundra have fuzzy fu hand and shoe cuffs.
Sally, Nicole and Nigel can create energy bladed weapons.
Off cours at least Sticks looks like a expy of Marine.