I do realize that TAs aren't intended to be equally represented in each universe and that some will have no equivalent on one side or another, but I have been trying to think of a good ATA for X-Factor teams and believe I have one: make it identical to the Outsiders TA.

Think about it; they were senior super-heroes hunting dangerous mutants like Apocalypse for the government and had massive resources at their disposal. It makes sense to give them an ATA that effectively neutralizes the target. That, and they don't currently have one at all.

Another good option would be the equivalent of the Superman Enemy TA.

I would also love to see ATAs for the Brotherhood, SWORD, Marauders, Heroes for Hire, HAMMER, and Hellfire Club.

It's just a suggestion and hopefully some food for thought.