Back in 4e, I created versions of (Critter) Form designed specifically for metahuman forms. Originally based on the concept that non-Great Dragons could use a spell to assume a human guise, I designed it for a Naga mage to be able to have a more normal face for times when being a 10m long serpent was less than optimal. Of course, that was when we had actual guidelines for creating our own spells. *sigh* I miss the customization options of 4e.
Anyways, here's the 4e version of the spell:
Type: Physical. Range: Touch (Caster only). Duration: Sustained. Drain: (Force/2)+1
Type: Physical. Range: Touch (Caster only). Duration: Sustained. Drain: (Force/2)
Type: Physical. Range: Touch (Caster only). Duration: Sustained. Drain: (Force/2)-1
This spell was originally designed for sapient nonmetahuman spellcasters, allowing them to assume a form that would allow them to interact with metahuman society better. The effect is like that of a Shapechange spell, allowing the caster to assume the shape and physical abilities of a metahuman. The caster keeps their own mental attributes, and assumes the physical attributes of the new form. Add 1 to the critter’s Base attribute Ratings for every hit the caster generates. The caster loses any physical nonmagical powers or abilities they may have had (Armor, natural weapons, etc.) for the duration of the spell, and replaces them with those of the metahuman form they acquire. For example, a Pixie would still suffer from Vanishing, and would lose their flight ability while in Troll form, but would gain the increased size, dermal deposits, and vision of the troll.
Metahuman Form allows the caster to assume the form of any metatype (including metavariants), with physical features chosen by the caster. Metatype Form restricts the effect to a single metatype or metavariant. Alternate Form allows the caster to assume a single form of one metatype or metavariant, with physical features chosen at the time the spell is learned.
Some metahuman casters have taken up this spell, using it as a more robust version of the Physical Mask spell, allowing for more effective disguises. However, as clothing and other gear are not affected by this spell, unless the clothes have been specially designed, they may be damaged by a form expanding beyond its normal size, or no longer fit correctly if the caster's new form is shaped differently from their old one (such as the case of an elf male taking the form of a dwarf female).