When making an RP character you should have at least the following in mind
Name: (Your character's name)
Appearance: (Clothes color/style, Hair color/style, visible things, etc.
Eye color: (Red, yellow, purple, green, big and grey, etc.)
Unique FeaturesL (Things that help distinguish your character e.g. Tattoos, markings, etc.)
History: (What's happened to your character so far)