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[Raijinili]

Skill classifications
By stat
Attack: Attack-type skills do damage based on the user's STR and the opponent's STR. Using an Attack-type skill while in Attack formation reduces your starting WT by about 10%. If a skill is directed at an enemy, but does damage not dependent on the stats, or no damage at all, it will default to being classified as an Attack-type.
Magic: Magic-type skills do damage based on the user's MGC and the opponent's MGC. Using a Magic-type skill while in Magic Formation ireduces your starting WT by about 20%.
Support: Skills that don't have a base damage. Usually used for skills targeting your own units, but also used for targetting the opponent's Rage or your own OverDrive.
Other: Skills that have neither a base damage nor a target. Usually reserved for skills that do nothing, but is also used for skills that have unique effects. As far as I can remember, only skills that do nothing (including Ledah's default "unusable" skill) and transforming skills (skills that either transform the item used or the user itself) use this classification. No, wait, Big Bear just used a skill that seems to raise its power for its next attack, and that skill is classified as "Other". "Run Away" and summoning skills also look like they're classified as "Other".

By rage (enemy only)
Enemy units have two slots each for Normal, Rage, and Max, but sometimes the second slot is the same as the first and sometimes the second slot is empty (the second case usually being for bosses). Some enemies have two slots for ETC and some have only one. Normal, Rage, and Max attacks can only be Attack or Magic type, but ETC can be any of the four types.
Normal: Basic attack. Has the least base WT of the three basic skills.
Rage: Used instead of "Normal" when the Rage bar is past 64%. Using it does NOT reduce the Rage bar the first time, but using subsequent Rage attacks without using a Normal attack seems to reduce the Rage bar by X * 4 percentage points, where X is the number of Rage attacks in the already used in a row. Has base WT between Normal and Max.
Max: Used instead of "Normal" when the Rage bar is at 100% (Max). Using it reduces the Rage bar to 0%. Has the most base WT of the three basic skills.
ETC: Used when special conditions are fulfilled (different for each ETC skill). The WT can be less than Normal, but is usually equal or greater.

By OverDrive (player only)
Each item with a specific character has one normal skill (exceptions: see note at end of section) and sometimes one Over Skill. To use an Over Skill you've learned, listen to Rose.
Normal: Basic skill. Does not require any OverDrive. Adds more OverDrive than Over Skills.
Lv.1: Requires at least one bar of OverDrive to use. Uses one bar of OverDrive.
Lv.2: Reuqires at least two bars of OverDrive to use. Uses two bars of OverDrive.
Lv.3: Requires a full OverDrive to use. Uses all three bars of OverDrive.
ExL: Does not require any OverDrive. Uses all available OverDrive. Does not add OverDrive. After finishing the skill, the OverDrive is shattered and no more Over Skills can be used for that battle. An ExL skill is actually four separate Over Skills, and which one is used depends on how many bars of OverDrive are full.

Basic stats
STR: Strength. Helps determine the damage done by Attack-type skills.
MGC: Magic. Helps determine the damage done by Magic-type skills.
AGL: Agility. Helps determine how quickly the unit's turn comes around, and also determines the unit's ability to dodge attacks.
VIT: Vitality. Reduces damage from enemy attacks.

Formulas
BaseWT: The WT given by the skill you're using.
floor(): Round down the answer in the parentheses
ceiling(): Round up the answer in the parentheses
AGL: The stat "Agility".

Damage formula (not here)

Starting WT formula for a given turn: StartWT = floor(BaseWT - (BaseWT * (AGL+K) / 100)). Alternatively, StartWT = floor(BaseWT * ((100-(AGL+K)) / 100))
Where K is 10 if you're using an Attack while in Attack Formation, 20 if you're using Magic while in Magic Formation, and 0 otherwise.

Max WT formula for a given turn: MaxWT = floor(BaseWT - (BaseWT * AGL / 100)). Alternatively, MaxWT = floor(BaseWT * ((100-AGL) / 100))