Actually, all of the rounds I've hosted (save for one) have been Ace Attorney themed. The forum I originally started my Mafia game series on was an Ace Attorney fan forum. (Kairon had alluded to this a long time ago when he made a comment about how a certain lesbian pairing was considered canon in that community. For the record, I do not consider Franziska/Adrian as one of my preferred pairings.) Since then, there have been a number of Ace Attorney inspired rounds held by other people in our Mafia game community, as well as non-Ace Attorney themed games (which has been a point of worry for some, seeing as we are literally drifting from our roots).
The "official" series of games in our community follow the cases of the Ace Attorney games. As of writing I am in the process of setting up the VIIth round, which follows case 2-2 (Justice for All, case 2: Reunion and Turnabout).
We actually did have a TWEWY-themed round once. And a House round... with some L4D references in it, to boot.