Mr. Ree is the Nexus Tower's wandering "Shady Vendor". He sells rare and expensive items but only carries two or three different items at a time.
His inventory changes in a similar fashion to Leroy Duddsmith, however it is considerably smaller. He is also similar to Heimlich Stewblaster, as the two are the only vendors to change position/move. However, while Heimlich can be seen walking around Studburst Pass, Ree only changes his location when all players have left the area he is in and the area he intends to move to. Also, his position varies depending on the server, so he can be at different places for different players. It is possible to make him move and change the items he sells by making "Go to friend" option. The area to which he moves to will always be randomized to a few points around the tower such as the venture league room, the assembly vendor rooms, the assembly hallways leading to the portals to the vendors, the paradox room, paradox vendor rooms, and the paradox portal closest to the Sentinel War Room.
Nexus Naomi is unable to locate Mr. Ree on her sensors, which can detect minifigures anywhere in the building. When she decides players need to clean Nexus Tower, she asks them to buy Hiccup Tablets from Mr. Ree to add "fizz" to the soap gun's water. Upon finding him, Ree says that he owes Naomi a favor, and give players the tablets for free.
Mr. Ree's name is a play on the word "mystery", which references his role as a seedy, shady vendor.
As a visual pun on his role as a shady vendor, Mr. Ree wears sunglasses, which are sometimes called "shades". These sunglasses are also reused from Johnny Thunder's beta model.
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