We have both a FFXIII cast (Light, Hope, Serah, Noel) and a sort-of KH cast (Ven. Just Ven atm but he's a cast on his own ok shhh) over at dragonhaven, which is a small/medium sized game with easy AC and a very backtag-friendly community. The FAQ can probably explain better than I can, but characters are brought from their worlds by dragons to be saved, and the in-game world actually consists of various locations from different canons. Player plots are more frequent than mod plots, but there's plenty to do and keep characters busy even in between those.
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We have both a FFXIII cast (Light, Hope, Serah, Noel) and a sort-of KH cast (Ven. Just Ven atm but he's a cast on his own ok shhh) over at