Preppers are the characters you use for Supply runs, Road Raids and they help you defent the Town during the Zombie attack. 

There are three main kinds of preppers that are color-coded:

• Support - primarily focuses on medicine and stealth parameters;
• Scout - primarily focuses on survival and search parameters;
• Fighter - primarily focuses on combat and technique parameters. 

Tip: carefully read the detailed description when recruiting a prepper, all of them have different roles insde each kind.