In order of creation:
- Fed Sci (main)
 - KDF Eng
 - Rom-Fed Tac
 - Rom-KDF Tac
 - Fed Eng (Delta Recruit)
 - KDF Sci (Delta Recruit)
 
Two of each faction if you count Rom as a faction; three of each if you don't. Two of each class. Seemed like the most even way to spread things out without making a dozen characters.
(Edit: formatting)