Alright here we go!
01. Bruce Wayne / Batman
02. Jason Todd / Red Hood
03. Tim Drake / Red Robin (*sigh* that's still a dumb name)
04. Stephanie Brown / Spoiler
05. Damian Wayne / Robin
06. Cassandra Cain / Batgirl
07. Barbara Gordon / Oracle
08. The Joker
09. Waylon Jones / Killer Croc
10. [ WILD CARD SPOT, will pick later ]
11. Peyton Riley / Ventriloquist
12. Charles Brown / Kite-Man
13. Mitchell Mayo / Condiment King
I am thinking something like Batman Family from back in the 1970s. So we will have an A-Plot with Bruce (probably) and then the second half of the issue will be one of the family members.
If anybody wants any of these people, just let me know. The Batfam is a rich tapestry and I can come up with something for virtually any combo of them.