MP+

MP+ is a recurring ability in the Final Fantasy series. It is a support ability that increases a party member's MP. Usually the boost is a set percentage of the character's base MP, though not always.

Final Fantasy IV
In the DS release, MP+50% is an Augment received from a house in Mist after exploring the Underworld.

Final Fantasy V
The White Mage learns MP+10% as it's level seven job ability, while the Black Mage learns MP+30%.

Final Fantasy VI
The Bard's Hat increases the equipped party member's max MP by 12.5%, the Minerva Bustier armor and Crystal Orb Relic grant MP+50%. Phantom has MP+10% as a level up bonus while Fenrir has MP+30%, increasing the MP the user gains when they level up while equipped with their Magicite.

Final Fantasy VII
The MP Plus Materia increases the equipped party member's MP according to its level, increasing MP by 10% at level one up to 50% at level five.

Crisis Core -Final Fantasy VII-
Materia can be granted MP+ as a support ability through Materia Fusion. The potency of the boost ranges from 10% to 999%.

Final Fantasy IX
Vivi, Quina and Freya can learn MP+10% and MP+20%.

Final Fantasy X
MP +5%, MP +10%, MP +20%, and MP +30% can be customized as support abilities onto armor.

Final Fantasy X-2
MP +10%, 20%, +40%, +60%, and +100% can be accessed by equipping various accessories. MP +10% can be accessed via equipping Black Ring, Arcane Tome, Black Tome, and White Tome, MP +20% by equipping Heady Perfume and Wizard Bracelet, MP +40% by equipping Silver Bracer, MP +60% by equipping Gold Bracer, and MP +100% by equipping Rune Bracer, Iron Duke, Minerva's Plate, and Key to Success.

Final Fantasy XI
MP+% is a bonus on various food and equipment, though food tends to have a soft cap. Summoners and Scholars (and Blue Mages, with the right spells set) have the Max MP bonus trait, granting them a bonus of +10 MP per rank.