Natalie: Before being killed by the Warlock Eames Natalie was a by the book Whitelighter. Her sometimes-gruff demeanor belied her depth of care for her charges, and her officious manner and professionalism were her way of protecting them.
Natalie possessed the normal Whitelighter abilities and, while alive, used them to guide several Witches, including the one Eames killed to gain the power of deflection.

Natalie

Nell: A Witch in the 1920’s. She used her magick to create a cursed painting to trap the Warlock Malcolm. It is unclear what her special ability was, but she obviously commanded a high level of magickal ability.

Nicholas: A Warlock that made a pact with Patty Halliwell in order to gain the powers of the Charmed Ones. In exchange for their lives Patty gave Nicholas immunity to their powers by blessing his ring. To stop Nicholas from killing them Grams bound the sister’s powers.
Nicholas’ power was the ability to boil the blood of his victims with a thought. This power was particularly disabling and acted very fast. He also possessed the ability to alter his shape and did not age.
To stop Nicholas The Charmed Ones first cast the spell to Unbind A Bond, sending them back in time to break his pact with their mother. Successful, they returned to the present where they were able to cast the Nicholas Must Die Spell and vanquish him.

Nicholas Must Die Spell, The: A spell specifically crafted by Grams Halliwell to destroy the Warlock Nicholas. It involved the mixing of a potion and the recitation of these words:

Lavender, mimosa, holy thistle,
Cleanse this evil from our midst,
Scatter its cells throughout time,
Let this Nick no more exist

Ninja Doll: A doll that Prue and Phoebe Halliwell used as a poppet in the awakening spell. As a consequence of the spell being cast for personal gain, the spell animated the poppet ninja, allowing it to move and spread Aroya fever with a stab of its ninja blade.

The ninja doll poppet

Nothing, The: An all-consuming entity. It lives in the pocket dimension intersected by the Ice Cream Truck. The Nothing is the only known way to vanquish the cadre of demonic children, but it does not discriminate; it will consume anything inhabiting it’s dimension, good or evil.