Ricky Hatton. Little guy who used excellent resiliance and superhuman workrate to bully his way inside and fight his fight 'on a postage stamp'. Only Mayweather and Pacquiao had the answer to his style and tactics, and along the way he destroyed a lot of truly great boxers with much better reaches/physical attributes. Just ask Castillo - a naturaly heavier boxer, who Hatton moved up a weight to meet- and broke 4 of his ribs with one body-shot.
If your short and stocky, Hatton is the greatest role model you could have as a fighter to learn from.