Something like that could work but doesn't motivate them to protect the emezon (charm only makes you friendly, not helpful). How about combining the two?
Here we go.
Pitiful Wail (Su): As a standard action, an emezon can moan and cry woefully. All creatures (other than amazons, sirens and harpies) within a 60-foot spread must succeed on a DC X Will save or become captivated. This is a sonic mind-affecting charm effect. A creature that successfully saves cannot be affected again by the same emezon's wail for 24 hours. The save DC is Charisma-based.
A captivated victim is charmed (as the charm monster spell, except that the victim's attitude toward the emezon is adjusted to helpful) and moves toward the emezon, taking the most direct route available. If the path leads into a dangerous area (through flame, off a cliff, or the like), that creature gets a second saving throw. A victim within reach of the emezon stop moving and tries to comfort and protect the distressed emezon, but will fight in self-defense if attacked. The effects of a pitiful wail continues for as long as the emezon wails and for 1 round thereafter. A bard's countersong ability allows the captivated creature to attempt a new Will save.
That'll do.
Yes. Your pitiful wailing has encouraged me to agree.
Was there anything else we wanted for these?
Good idea!I'd rather make Zee Chefs be old/exceptional emezons that have developed intrinsic magical abilities, the same relationship as Stone Giant Elders to standard Stone Giants.
Did you ever start a Working Draft for these?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.