Well, I have a bit of plot planned out already for scenarios similar to that. As for them already being someone in the compound, that will work. I have a few groups in the compound picked out, but there are also purposefully undesigned characters as well. There could be several people already in the compound that haven't been assigned groups yet, or might not 'fit in' with the rest of their group, so they decide it's better to find other groups to work with.
I need to start writing out the groups, characters, and bios for the characters I have so I can keep track of them, and reference them properly. I have several other 4D hero groups picked out that our characters will run into, but writing them somewhere will help make it easier for me to reference.
Speaking of characters, I still don't have Mr. Boss and the labcoat guy 100% written out. I have their backgrounds, thoughts, ideals, future-development, all that jazz, picked out... but I don't have any ideas for their names, or heritage. I was originally thinking the lab-coat guy was Japanese... but you pointed out he seemed different, so I thought Scottish... but I'm not sure. As for the boss-guy, he's supposed to be kind of heavy-set, without being considered unhealthily overweight, as well as slightly tall (But not to match Kristof, that's for sure.) Any ideas?
I was thinking something like... for Mr. Bossman to be "Humphrey Branton", perhaps? I'm not sure. I really want to get names down for these guys so we don't have to say "Mr. Labcoat" and "Mr. Boss" all the time. Give some variety! Eh?