The tour guide was programmed to take people on a tour of the REPCONN headquarters before the Great War. It remains in 2281, still wandering the halls and looking for any "Rocketeers" to educate them about RobCo.
Physically it is a Mister Handy that has been reprogrammed to be a tour guide. It is very friendly and branded with the REPCONN logo. Compared to other Mister Handies, it is slightly green in appearance, much like the maintenance robots found in the facility. The tour guide also lacks any tools other than graspers, likely to seem less threatening to visitors.
The Tour guide helps anyone who visits the REPCONN headquarters with a guide of the building, as long as asked during the appropriate hours. It will explain about radioactive waste, missiles, spaceships, plasma, and of course, robots. It will also unlock the Planetarium for the Courier.
The tour guide appears to have taken out several Fiends before the building is entered, but it will not attack unless provoked.