Did you catch the localized Dissidia 012[duodecim] trailer yesterday? If not check out this post. Done? Good.
Lightning appears to be at the center of all the events on the Cosmos side, but every new character in Dissidia 012[duodecim]: Final Fantasy has a storyline to follow. Yuna, unlike most characters, retains at least some of her memories. She gets between Jecht and Tidus who starts off as a Chaos character in Dissidia 012[duodecim]. Laguna acts like a wise big brother and Tifa… well check out the screenshots from her event scenes below.