Magi: Necromancers, Lich and the Unapologetically Evil.

This group includes several well known characters used in a generic way just based on how they look.  Mumm-Ra looks like a Lich.  Skeletor looks like a Necromancer.  

MAGI: Non Western Wizards/Shaman

Plenty of magic users outside of European tradition.  Includes figures from various classic toy solder makers.  

Game figures, Wizardry Board Game, Disney

Wizardry Board Game

Wizardry Board Game

Wizardry Board Game, MPC

Various 

Various

MAGI: Druids

 Some of these Were not actually made to be druids but still look the part enough that I include them.  

Biplant, Starlux & Cafe Storm

Warhansa & Navia Drapt

ThorenFigurn

MAGI: Classic Witches.

More than just pointy hats. 

Disney Store & Hasbro Narnia White Witch, Willow Bavmorda, Battle Toads Dark Queen.

TSR Skylla, Disney Maleficent, Safari Toob Witches

Game figures. 

Marx Fairytale figure & Toy Major 

MIMP, Terrible Monsters, MPC, Aurora Wizard Oz, Deluxe Reading.

Dollar General Halloween Witches.