JamJam, BamBam, ScaryBlue, Minion, and JumboJoe are NPCs that can be found in-game, but will not enter the elevator.
Appearance
JamJam, BamBam, ScaryBlue, Minion, and JumboJoe all appear in-game as a blocky humanoid, with buff arms and legs, a one-eyed grin, and varying colors and height.
Interaction
JamJam, BamBam, ScaryBlue, Minion, and JumboJoe can all be seen within the Area 51 floor. With JamJam attacking players as they try to reactivate 6 generators, and the other 4 being used to protect one of the generators.
But in terms of functionality, all of these NPCs act similar to each other. They rest in one spot, and when a player enters a room that has one of the NPCs in it, the NPC will run to the player, trying to attack them.
However, unique to JamJam, it will occasionally jump, most likely to prevent players from standing on top of the main room's generator. Upon contact with one of the NPCs, you will lose 5 HP, and teleport to the beginning of the generator room. Once there are no more players in the room, they will go back to their resting spot.
Trivia
JamJam, JumboJoe, and BamBam are references to the game series Garten of Banban, however Minion and ScaryBlue are not (the Minions and Rainbow Friends respectively.)
The NPCs are also references to a meme where someone looks at Roblox avatars while talking about the avatars in a funny way.
Minion's new look
With BamBam, ScaryBlue, and JumboJoe also being references to the Zumbo Sauce meme.