Community: Ranking Every Character Worst To Best
11. Professor Ian Duncan
According to Ken Jeong's and Joel McHale's podcast, The Darkest Timeline, Professor Duncan was initially intended to be a part of the main cast of Community, before actor John Oliver began hosting the talk show Last Week Tonight with John Oliver.
His importance in the Pilot, and his role in bringing Jeff to Greendale, makes more sense with that in mind, and the show may have been improved if Oliver stuck around. However, we'll never know for sure.
Despite his initial importance, Duncan only appears in Seasons 1, 2, and 5. His absence in the remaining seasons is never explained, and only acknowledged in a tongue in cheek way when Troy remarks that they haven't seen him in a while. Though his banter with Jeff and crush on Britta are hilarious, we barely notice his absence, and therefore he can't crack the top ten.