Stoned Ape
Savant
Vivi does get haste.
Bard is generally a solid choice for a force multiplier.
If you wanted something a bit different you could go for some type of Barbarian (or a Primalist Bloodrager) with reckless stance and inspire ferocity for a +AB (but -AC) aura.
A Freebooter Ranger is also an excellent choice with two excellent infinite use buffs. Probably best built as an archer so you free up their move action as much as possible to spam the buffs as needed.
Bard is generally a solid choice for a force multiplier.
If you wanted something a bit different you could go for some type of Barbarian (or a Primalist Bloodrager) with reckless stance and inspire ferocity for a +AB (but -AC) aura.
A Freebooter Ranger is also an excellent choice with two excellent infinite use buffs. Probably best built as an archer so you free up their move action as much as possible to spam the buffs as needed.