1. Create a story for you character, then search for references (personality, outfit, weapons, etc).
2. Choose 3 drawing styles and draw your character in each one of them. Lately, draw him/her in your own style (based in the others).
3. Draw 2 outfits with 2 different color palettes.
4. Create his/her main weapon/tool/object!
5. Imagine him/her in a 3D view and draw a turn around with at least front, side and back views.
6. Finally, redraw your character in a 3/4 view with a different pose.