Oh, right. All character 'jacks, and units. Solos are a different story, and it's tough to use all non-character solos. So, they are exempt.
I think we might just have to make it character 'jacks. Because there's a lot of Merc units that are character as well.
I'm still messing around with the list, so it's likely going to change anyways. All I'm really concerned with at the moment is the battlegroup.
I'm probably going to fit Gun Mages in there instead, and likely some different support solos.
So, let's just say the official rule is no character 'jacks, or epics, or in-faction character units (barring Merc/Minion units) allowed until week 4.