Archie Bell

Archie was the name of the "very strange man" who ran Torchwood 2 from its base above a bank in Glasgow.

"Old Tartan Archie" did not have the hang of computers and exchanged bizarre emails with Ianto. The words used were "interesting and in the wrong context" and he refers to himself in the third person. His ineptitude with email caused him to send a picture of the Loch Ness monster to the Glasgow Herald. (TWN: The Twilight Streets)

Donna's World
If Donna Noble had turned right instead of left, her world, with both Owen Harper and Toshiko Sato still dying in that world, both Gwen Cooper and Ianto Jones would have been killed in the ATMOS Sontaran invasion of Earth and Jack relocated to the the Sontaran homeworld, leaving Archie as the only remaining, though never seen as of yet, member of the Torchwood Institute. However, with all the major invasions that the deceased (in that world) Doctor and Sarah Jane Smith unable to stop, nor Torchwood, Archie could have even been killed himself, considering how the whole world was falling apart in the Turn Left world.

Behind the Scenes
Jack Harkness first mentioned Archie (not by name) in Everything Changes. John Barrowman has suggested at a public appearance that if he ever appeared on-screen, David Tennant should play him, wearing heavy make-up.