OFFchan was an OFF-themed bulletin board that was presumably run by the TF2chan staff¹⁾ from 2013 to 2015. The community was never huge, compared to Uboachan, and more of a passing fad. That's really all there is to say on the matter.

During the 2013 popularity spike for OFF, “The Batter” would establish OFFchan at the “offchan.net” domain using Kusaba X on April 15, 2013,²⁾ though the opening was delayed to April 20, 2013,³⁾ and they notably received Georis's permission beforehand.⁴⁾ Due to persistent CSAM spam and a lack of users, OFFchan was taken offline in early 2015 and the domain proceeded to get parked.

• It must be noted that OFF's 2013 popularity spike was helped by Homestuck's 'Megapause' hiatus, especially when the staff were already familiar with it.⁵⁾ I was the user banned as a joke.
• You do have to wonder what the staff was expecting, since the game is quite short and it doesn't have that many characters in the first place. I mean, at least make a fan games section.
• This should not be confused with “offchan.org”, another cyberpunk-themed bulletin board.

• TF2chan - This is, mostly likely, the same administration.

• OFFchan [Archive] - The front page of OFFchan, archived December 31, 2014.
• OFFchan on Steam Community - The only remaining evidence that OFFchan existed.