HP – Health Points of your character. When reaches 0, your character will die.
ATK – Affects the amount of damage done by your character’s Physical attack. It also affects the amount of damage done by spellblade attacks (eg. Thunder Strike).
DEF – Reduce damage done by physical attacks.
MAG – Magic affects the damage done by Black magic and Summon Magic.
RES – Reduce damage done by Magical Attacks.
MND – MND affects the power of white magic (mainly heals).
ACC – The hit rate of physical attacks. The higher the number, the lower the chance to “miss” a physical attack on enemies.
EVA – The higher your evasion, the higher the chance for an enemy to “miss” hitting you.
SPD – The speed in which your ATB bar recharges.
Note: They are working on the stats for Magic ACC and Magic EVA. As for now, it is not confirmed whether MAG or ACC affects the Magic ACC (same for RES and EVA for Magic EVA).