I used to play an app. on Myspace called Nightfall Bloodlines. On Nightfall Bloodlines players were able to have 10 totally different character builds called "Beta Characters". Each of the 10 characters shared game credits and squad but in all other aspects of the game each were totally independent. The player could only switch from one character to another once every hour.
I feel like this would be an awesome addition to Zombie Slayers and would also address several other ideas/request and problems. (examples... reallocating skill points, the start over button, multiple accounts)
*whispers* possible increased revenue from pay to play players
Speaking from several years of experience playing an app. where this option was available, PLAYERS LOVED IT