The Institute are the boogeyman of the wasteland in Fallout 4. Now they can do the same on the tabletop.
The Institute has an army of synths, humanoid robots with varying amounts of human appearance and personality. Gen 1 are the weakest, essentially acting like zombies.
Gen 2 are still unlikely to pass as human, but are closer. Both of these specimens have seen better days.
The Courser is a gen 3, a terminator sent out to take care of rogue elements. They have stealth and teleportation. What fun!
The Scientist is an actual human. At least probably. Protect them as they go about doing sciency things.