I watched Super Bowl XLIX yesterday and was glad the game turned out to be more interesting than the ads running during breaks in the action. I did notice during an advertisement for the NFL’s “Together We Make Football” campaign, there were three groups of fictional characters from animated works shown cheering for different football teams: The Lego Movie for the New Orleans Saints, My Little Pony: Friendship is Magic for the Indianapolis Colts, and Penguins of Madagascar for the San Diego Chargers. That got me thinking about characters who have explicitly stated they’re fans of real-life sports teams in their series.
In Azumanga Daioh, Chiyo is a fan of the Yomiuri Giants and she gets into a short argument with her classmate Tomo in the anime’s 9th episode about which team will the title in the next baseball season, the Giants or the rival Hanshin Tigers (Tomo’s pick).
Kuroi-sensei from Lucky Star mentions in volume 1 of the manga that she’s a fan of the Chiba Lotte Marines (and the Hanshin Tigers, to a lesser degree).
Those two are all I’ve come up with for now, aside from obvious ones like Family Guy‘s Peter Griffin being a Boston Red Sox fan.