It's what I'm trying to do, but we actually have too little material on XV to talk about that without thinking of Versus =X
Hopefully they show enough of XV in a few weeks for people to finally understand what this game is and is not.
Hopefully we get enough info on various characters in FFXV. By the time FFVII(in Japan), I knew about all the main characters(including "secret" characters, Yuffie and Vincent), all Shinra Company(President, Rufus, all the Turks, Heidegger, Scarlett, Palmer, Reeve, Hojo), Sephiroth, Jenova, Biggs, Wedge, Jessie, Marlene and Don Corneo. By the time FFVIII was released, I knew about all the main characters, Laguna, Kiros, Ward, Seifer, Fujin, Raijin, President Deling, Edea, Adel, Cid, Julia and Raine. By the time FFIX was released, I knew the main cast, Queen Brahne, Kuja, Cid, Artania, Zorn, Thorn, Quale, the Black Waltzes, Puck, Mog, Stiltzkin, Artimecion, all of Tantalus, Beatrix and Lani.
For FFXV, we know the main characters(Noctis, Ignis, Prompto, Gladiolus, Cor), Regis, Idola, Luna and Cidney. There are other "faces" we know, but names of them, we don't. Hell, we still don't know much about those we DO know the names of. We don't know how different Luna will be from Stella(and we really didn't know much about Stella, either). We know there is a Cid, proper, but don't know much of him other than he's related to Cidney. We don't know the man with the purple hair and hat, nor the general-looking man leading the army. Not know whether that one character near Regis is, in fact, his brother(Noctis's uncle) or Gladiolus's father, or someone else entirely(it's all speculation, not fact).