Alright buds this has been bothering me for QUITE some time and to tell you the truth, this bug has been growing ever since they announced and Sho'd Sho.
Let me back it on up first.
Back when they first announced P4U2 for the first time and began play testing (late August), they had this character select screen:
Yeah cool right? Yukari and Stupei make the scene and everyone's pants were knocked off seeing these two folks make an appearance.
Then things took a turn when Sho was announced:
Woah, wait a minute what the hell are those 4 character slots?
If I brought this up back then, this would've been a pretty hype mystery. However, since I'm super late with this, we all know that, well, we have two of those characters slots filled with Rise and Ken/Koromaru. Sexy.
That and it's been implied that Adachi will in fact be playable. Of course we have nothing solid yet, but the fact that he has a dramatic part in a trailer, has an in game sprite, and appears to have an important part in the story, I believe it's safe to say he'll be playable. No breaks on the Jester Train.
Now we theoretically have 3/4 of the characters: two who are from P4 and one from P3. I bring that detail up because of the half-subtle way AtlusxArc decided to layout the character select screen. Notice how the top row is essentially occupied by the Big D. OGs Investigation Team and Sho's, both groups originating in P4. Now look at the bottom row, we see that it's the Almighty Hype Lords of S.E.E.S, with the exception of Labrys who is a new member of S.E.E.S but had her first appearance in P4U (unless you wanna be 'that guy' and bring up that she actually was first mentioned in a Drama CD for P3.)
So if I were to predict the way the 3 characters were to be laid out I see:
Rise and Adach fill in the final two spots in the first row and Ken/Koromaru the second row.
So who will take the final slot?
And that my friends is what I want to discuss. If I'm correct in my assumptions it should be a character (preferably alive for the sake of story quality) from P3.
It might be you know who, but to be honest I seriously hope it isn't.