There's a Half-Nymph template in Dragon 313.
Type does not change (not even to Fey), can be applied to any humanoid.
Awesome Beauty: Any humanoid who looks at you within 30 feet must make a will save (cha based) vs shaken for 1 minute. They have to make the save again every time they look at you or the duration is refreshed. You can turn it on and off as a free action.
So... it could possibly shaken your allies, only works on humanoids, but essentially lasts FOREVER while you're busy being so pretty, oh so pretty.
Half Nymphs also count as Fey for spells, have Low Light Vision and get Dex +2, Int +2, Wis +2, Cha +4.
LA +2.
Figured this would be of interest.