The Hyper Wrist and Bone Wrist increases the wearer's Strength by 50%. Various Espers grants a permanent boost to Strength when the equipped character levels up.
Materia Fusion can grant ATK+ to Materia, increasing Zack's ATK up to 100 points on a single Materia. The SP Turbo and SP Turbo Attack Support Materia increase the damage done by Zack's attacks by 20% for each level of the Materia, but cause Zack to expend SP when he attacks.
Guardian Forces can learn Str +20%, Str +40%, and Str +60%. The Str Bonus ability increases a character's Strength by 1 on level up, and unlike the +% abilities the boost is permanent for that character.
The Battle Lore Augment on the License Board grant the character +1 Strength when taken. The Focus Augment increases damage by 20% when the character has full HP, and Adrenaline doubles damage when the character is at critical health.
Strength: +X% is a passive ability that increases Strength by X%. It is a passive ability for the following Paradigm Pack monsters: Apkallu, Behemoth, Chichu, Chocobo, Dreadnought, Flangonzola, Gandayaks, Mandrake, Meonekton, Miniflan, Seeping Brie, Thermadon, Tonberry, Uridimmu, Vodianoi, Vouivre, Yaksha, Buccaboo, Buccaboo Ace, Fencer, Grand Behemoth, Koboldroid Yin, Munchkin Boss, Tabasco Toad, Major Moblin, Metalligantaur, Silver Lobo, Gigantuar, and Omega.
It can be also be found on various weapons and accessories: Wild Chorus, Power Wristband, Delicate Power Wristband, Durable Power Wristband, Brawler's Wristband, Delicate Brawler's Wristband, and Durable Brawler's Wristband.
ATK Boost has six different levels, each increases ATK by a greater amount than the previous level. ATK Grow, much like Str Bonus in Final Fantasy VIII, increases the amount of ATK the character gains upon leveling up, depending on the level the ability is at currently. ATK Boosts can be customized onto equipment via Strength Stones, while ATK Grow is customized onto equipment via the Small Ruby and Ruby.
The Power MAGI increases a Robot's HP by 99 and Str by 22 when equipped on them. Power increases the equipped character's Str by 5 and adds 1 point of Str to physical damage for each MAGI the player possesses.
Monks learn P.Attack 10% Up at job level 9 (requires 1 slot to equip).
Pirates learn P.Attack 20% Up at job level 9 (requires 2 slot to equip).
Dark Knights learn P.Attack 30% Up at job level 12 (requires 3 slot to equip).
STR +20% is the level 13 ability of the Warrior class, requiring 280 AP to learn. It requires 1 slot in order to equip and use.
Various accessories grant boosts to ATK. Some accessories and weapons grant percentage-based boosts to damage and physical damage.
When an Equip ability is mastered, the character learns an Adept (in Dissidia) or Master (in Dissidia 012) for that type of equipment. When the Adept/Master ability is equipped while the character has a weapon of the corresponding type equipped, the character has a +5% damage boost.
Strength Up comes in three levels of power, each level granting a larger bonus to Strength and damage during BMS sequences, but Lv2 and Lv3 carry a penalty to Agility. Strength Up Lv1 increases Strength by 20 and increases damage during BMS to 1.1x times normal, Strength Up Lv2 offers +40 Strength and 1.3x attack power but has a penalty of -60 Agility, and Lv3 increases Strength by 65 and increases attack power to 1.5x normal, with a penalty of -120 Agility.
Strength Up (Lv1) is a proactive ability that costs 5 CP to equip. It increases parameters while equipped. It adds 25 to Strength. It is learned by Warrior of Light (initially), Kain (level 20), Tifa (level 5), Auron (level 5), Auron #2 (initially), Orlandeau (initially), Zack (level 10), and Machina (level 5).
Strength Up (Lv2) is a proactive ability that costs 10 CP to equip. It increases parameters while equipped. It adds 40 to Strength, but drops Agility by 30. It is learned by Warrior of Light (level 35), Kain (level 55), Tifa (level 50), Auron (level 45), Auron #2 (level 35), Fran (level 25), Benjamin (level 70), Zack (level 35), Machina (level 50).
Strength Up (Lv3) is a proactive ability that costs 16 CP to equip. It increases parameters while equipped. It adds 70 to Strength, but drops Agility by 60. It is learned by Kain (level 85), Tifa (level 85), Auron #2 (level 75), Orlandeau (level 10), and Zack (level 75).