I had a talk with Evrae through Discord the other day because she was saying "Thank god Square added Braska to Dissidia 🙄", and then she proceeded to tell me the fact Kiros and Ward, Genesis and Angeal, all the FFIII 3D Remake characters, many relatively important characters haven't been added yet. Which shocked me, as most of those are actually in RK, like the ones from FFII, FFIII, Genesis, Angeal, Kiros, Ward, Edea, Larsa, Reks (no Reddas or Vossler though), Ravus (one of the last ones implemented. The truly last one was one from FFXI). She did mention no Turks or deepground, only Shelke (consistent with RK. If Reno, Elena, Rude and Rufus are in Dissidia that's consistent too), but no Tseng, no Before Crisis or even Cissnei (actually, you do have Cissnei in Dissidia, I think. She isn't in RK though), no other Tsviets (doesn't surprise me that much. But they would be really cool. They aren't in RK as well. They are bosses, but that's all).
I didn't know Jessie was there, let alone Cid from FFXV. He isn't playable, is he? Tf?
Anyway, we went and joked that Square would even add Tiz and Joker from Type-0 (they're also not playable, but do belong to the original class Zero), I mentioned Rosche from the Remake (I don't even know him). Heck, I mentioned a bunch of people from FFX-2, Baralai, Gippal, Nooj, Shuyin, Lenne. All those. I believe Shuyin could be an essentially fun one, if not in Dissidia, in RK. I like to imagine a Soul Break where he plays the Vegnagun and Lenne is singing as well (because sheya singer and stuff). She did mention no Tantalus members were added. In RK, we do have Marcus, but he's the only one (aside from Zidane, of course), but that's most definitely because of the Record Dungeons, since you participate in the story of the original game and Marcus appears at two distinct times, so he gets more credit.
She was most complaining about the new mechanic called Force that's between two characters and the some weird combinations they have like Gau and Gabranth or Braska and Sherlotta (from Crystal Chronicles. No CC characters in RK, but thank go we have Mobius and Dimensions). Sounded pretty fricked up, if you ask me.