Kyle, if this is what you mean by jump loop,
then I'll refer you to the following post:
This means the jump loop (solo Carl, no robot) only works on Hakumen, Jin, Tager, and Hazama, and on Lambda, Litchi, and Noel with robo push. It doesn't work on anyone else. As far as I've tested, the corner doesn't add any additional characters to this. I tried doing the combo with solo Carl in the corner on Lambda and Litchi (who can be jump looped with Nirvana pushing), and it still didn't work.
Of course there are a few more characters you could count in a fuzzy guard situation off of jump cancelled 5B (not 6B, since we established that you can't) such as Ragna. But as for the comboable characters, it's only the 7 I've listed above if I've tested correctly.
EDIT: Hmm, now I see that you might have meant that already comboable characters (Hazama, Jin, Tager, Hakumen) can be looped only in the corner. This is probably true.