Having scampered through all sorts of weird and wonderful environments in my life, this takes the cherry.
I think the rapper's loudness and anger might be a tell of holding a strong hand: he's present (excited?) and wants to win. Or maybe he's having a draw and is rapping his cards on to build into something stronger or more complete?
The white guy seems quite straighforward. Unless he gets lost in his head space, which would make him also pretty unreliable in his tells.
Pops is def the most fascinating of your regs. Would love to hear how his conduct develops