• Glasses (the geekyer, the better?)
• Brown eyes
• Brown/black/dark hair
• Mohawk
• Fauxhawk
• Spiky hair
• Generally short hair
• Dimples
• Toned body, not too muscular
• Hats
• Sixpence
• Vests

Oh yeah, and the ultimate 50's "Grease" style:

• Worn jeans
• White tee
• Leather jacket
• Swoon*