I think working out the characters personality and storyline beforehand is fun, because I am into literacy and creating stories and character etc.
When it comes to actually creating the character, I don't know, I've always loved choosing the markings, eyes, and colours.
It's just entertaining to play around and try different styles to match the characters personality. Working out the design is just fun (blame my artistic eye).
I just love making characters in general. OC's or RP charries.