For my part, I love cryptic.

Now, when you say "like in a text message" I'm thinking either a) translated to the numbers corresponding to those letters on a phone, i.e. 5477 968 for "kiss you", or b) some kind of text message abbreviations. For "kiss you" this might be, for example, "kiss u", or "x u" (x as in "xoxo" )

"U" is, at least in the abbreviation R=U, representative of Ultimecia. Which brings us back to sorceresses.

I'm just loosely speculating here, you don't need to tell me if I'm on the right track or not. It's just that typing out my speculations often helps me get ideas.