It has come to my attention that people are disappointed I am taking this so seriously. So...
Baten Kaitos 2
The advantage of Baten Kaitos 2 is many-fold. First, it breathes life into a nearly dead system with some other games left on it. Particularly, since it is the sequel to a best-selling Gamecube game (reference: the game box), there should surely be a large number of people, fans, that would flock to see the game do well. In addition, we know that the system isn't tough to work with - Goku in NR, from a card game with far, far more problems translating, did well enough to win Godlike with not total fail vote draw (and this was a long time ago). There's also lots of interest - the characters and storyline draw a lot of people in, and each character is pretty unique in what they do. There's a large amount of write-up bait, and several solid bosses to rank, as well as the main PCs. It's even a small rank, so if characters should prove to be poor on vote draw or prone to "robbing" people (unlikely, but it could happen), then there at least isn't a large amount of characters to compete and continue pressing those issues. It's also very cheap and not exceptionally long, so people can easily pick it up and play it.
Rhapsody
Yes, it's old. But it's also one of the most unique games we can rank, and it has plenty of connections to other games in the multiverse, in addition to being very popular with the fans, having suggestions in the past. Characters are generally pretty easy to rank as well, and there's a significant connection to the DL's sister site, RPGDuels. Why not foster some love with others? The game is a bit expensive, I'll admit, but it's ungodly short and easy, so people can blow through it fast. Strikes me as a good niche game to rank to draw more people in - hype for Marjoly in Godlike and massive pancakes crushing Middle is exceptional write-up bait, which we cannot ignore if we want the DL to survive.
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Ahem. Good thing I stopped there - I probably could have gone on way longer. Anyway, my real suggestions...
Persona 3 - It's...well, I think the fact that it has more interest lets it beat FE9 to me. More uniqueness in fighters, and generally growing...it's like SH:C. Granted, I know there is some grey area in regards to that (too early is bad, etc.), but I feel like this would be a better choice than FE9 at the moment. Both games would be good, and either in the next stage could pass well enough overall comparatively. I just feel that the overall benefits of P3 are better than FE9 right now - the only weakness I can see is lower vote draw, which isn't horribly lower, and will surely grow.
Disgaea 2 - As I mentioned earlier, the most balanced of the big 3. Definitely is the best choice overall, and the best candidate to go past stage 2 to actual ranking.
Current Tallies as of muakaka's post below:
P3 - iiiiiiiiiiiiiiiiiiiii (20)
D2 - iiiiiiiiiiiiiiiiiiiiiiiiii (26)
FE9 iiiiiiiiiiiiiiiiiiiii (21)
And since I do this everytime in this session just to get people thinking...
All the people I could think of that would be potentially ranked from each of the top 3 games!
***SPOILERS MAY BE PRESENT BELOW - READ AT YOUR OWN RISK***
P3: Minato, Yukari, Junpei, Akihiko, Mitsuru, Aigis, Koromaru, Ken, Shinjiro, Chidori, Jin, Takaya, Ryoji/Nyx/Pharos (Metis in Fes, even though that isn't considered for ranking at the moment...don't think anyone else really fits from the game besides her) - total 13
Disgaea 2: Adell, Rozalin, Tink, Hanako, Taro, Yukimaru, Axel, Fubuki, Shura, Serion, 'Zenon' - total 11
FE9: Ike, Titania, Oscar, Boyd, Soren, Mist, Volke, Ranulf, Elincia, Ena, Petrine, Oliver, Tibarn, Naesala, Rhys, Shinon, Gatrie, Rolf, Mia, Marcia, Lethe, Mordecai, Nephenee, Kieran, Brom, Jill, Astrid, Tanith, Janaff, Ulki, Haar, Bastian, Lucia, Geoffrey, Ashnard, Illyana, Zihark, Sothe, Makalov, Tormod, Muarim, Stefan, Devdan, Resyon, Callil, Tauroneo, Largo, Nasir, Giffca, Black Knight, Bertram - total 51 (too damn many - hope I didn't miss any)
FE9 Minimized (based on what I think are the general thoughts of the group): Ike, Titania, Oscar, Boyd, Soren, Mist, Volk, Ranulf, Elinica, Ena, Tibarn, Naesala, Rhys, Shinon, Gatrie, Rolf, Mia, Nephenee, Jill, Ashnard(?) - total 20 (21)