Shonen Jump Leaks! Yuna, Barthendulus and Zeid info
FFXI is getting a Chaos rep with Zeid (though he's not a bad guy in FFXI, he's like Golbez).
Zeid can use Dark Knight magic like Drain and Absorb-STR and his weapon skills from FFXI but he has to build TP to do so (he has a TP bar below his char portrait that fills whenever he deals or takes damage). Ex-mode is Equip Ragnarok which increases the damage he healds when he lands a critical hit, Ex-Burst is Souleater (dunno how it works).
Bart is similiar to Ultimecia in his normal form (long range mage) while his Ex-mode is stationary, but his attacks are quick and have huge range. His Ex-burst is Destrudo (the move he uses in the first fight).
Yuna is a Summoner on the ground (summons work like elemental spells, you don't actually see them on the field) and Gunner in Air (she changes style like Cecil), Ex-mode is Special dressphere from FFX-2 (Floral thing). She's stationary like Bart's Ex-mode but she can heal herself so you can't just let her do that. Ex-Burst is Great Whirl.