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This faintly glowing ball of light bobs gently in the air, the nebulous image of what might be a skull visible somewhere in its depths.

CR 6
XP 2,400
CE Small aberration (air)
Init +13; Senses darkvision 60 ft.; Perception +17
AC 26, touch 26, flat-footed 16; (+5 deflection, +9 Dex, +1 dodge, +1 size)
hp 40 (9d8)
Fort +3, Ref +12, Will +9
Defensive Abilities natural invisibility; Immune magic
Speed fly 50 ft. (perfect)
Melee shock +16 touch (2d8 electricity)
Str 1, Dex 29, Con 10, Int 15, Wis 16, Cha 14
Base Atk +6; CMB +0; CMD 24
Feats Alertness, Blind-Fight, Dodge, Improved Initiative, Weapon Finesse
Skills Acrobatics +21, Bluff +11, Escape Artist +21, Fly +31, Perception +17, Stealth +25
Languages Aklo, Common
SQ feed on fear

Feed on Fear (Su)

Any time a will-o'-wisp is within 15 feet of a dying creature or creature subject to a fear effect, it gains fast healing 5.

Immunity to Magic (Ex)

Will-o'-wisps are immune to all spells and spell-like abilities that allow spell resistance, except magic missile and maze.

Natural Invisibility (Ex)

Will-o'-wisps have the ability to extinguish their natural glow as a move action, effectively becoming invisible, as per the spell.
Does invisibility purge work on creatures that are naturally invisible?
In general, yes--nothing in the spell description says it only works on spells or other magical sources of invisibility. However, note that the invisible stalker's natural invisibility specifically says that it is not subject to invisibility purge. Thus, will-o'-wisps and pixies become visible, but invisible stalkers do not.