Do you need some more magic in your game? Perhaps you want your character to temporarily hinder an opponent? Steven’s curse of man spell could give you a flavorful option for imposing humanity upon a humanoid.

Curse of Man

School transmutation [polymorph]; Level cleric 2, druid 2, sorcerer/wizard 2, witch 2
Casting Time 1 standard action
Components V, S, M (a single gray hair)
Range short (25 ft. plus 5 ft./2 levels)
Target one living humanoid creature
Duration 1 min/level
Saving Throw Fort negates; Spell Resistance yes

You force the fragile nature of humanity on your target. If the target fails the save, it succumbs to three effects. First, the target loses the low-light and darkvision special senses for the duration of the spell if it has them. Second, it appears to age instantly and suffers a -2 penalty to its physical ability scores for the duration of the spell. Multiple castings of this spell do not stack with one another, and no ability score can be reduced below 1 because of this spell. Finally, any racial skill bonuses the target had are lost for the duration of the spell.