NBA - Main

Lots of people are going to try and tell you to root for their team, but trying to offer an unbiased opinion... Regarding team history, I recommend considering a team that hasn't won a championship, or at least hasn't won one in a very long time. The reason is that the more decorated a team history, the more likely you'll encounter a significant number of fans who gatekeep that, looking down on fans who weren't there during earlier eras. Success breeds obnoxiousness in fanbases. Plus nothing is better than being there for when a team gets over the hump and wins a championship that took a long time coming.

Consider the Pacers or Kings; super-entertaining style of basketball right now, and some excellent up-and-coming players. Very chill and friendly online fans. Both have some interesting team histories... the Pacers being one of the ABL merger teams, the Kings bouncing around a lot before finding a home in Sacramento, both teams having some cool eras that they can look back on, the Reggie Miller era for the Pacers and the Webber era Kings). OKC and Memphis kinda fit into this category except the Grizzlies are a mess this year, and the Thunder are everyone's popular pick for next rising team. Maybe the Magic, if you like hard-nosed defensive basketball over offense.