Yuna the steadfast summoner from Final Fantasy X is a playable character in Dissidia 012[duodecim]: Final Fantasy. She uses Aeons in battle. These screenshots show her summoning Bahamut to hit Jecht with Mega Flare. The other screen shows Yuna calling Shiva and Ixion at the same time.
This week’s issue of Famitsu has a look at the third form of two other Final Fantasy X characters. Tidus’ blitzball ready outfit is based on artwork from Yoshitaka Amano. Jecht’s costume also appears to be blitzball garb.