Familiars are usually Caìt Sìth who enjoy spending time in the mortal realm in the company of witches. Other familiars from Faerie include various faery-hybrids: monkeys, bats, rats, ravens, roosters, etc.
As with the Fae, human magic-users are classified under their own gifts as well. Some control fire, some water, some air (wind), some earth, and some even control soul (powers of the mind, powers of others, the dead, etc.). Some even have power over that which dwells within their element of control. Rarely, a witch will have equal power over all elements.
Witches use grimoires to extend their knowledge and power. Some have bonded with Familiars (see the types of Fae above) who advise them. They are also big on rituals, schooling and belonging to groups. Though they view individual witches to be suspicious, that is in no way an indicator of villainy.
Just like any other type of being, witches can be good or evil, old or young, etc.
Only Druids seem to naturally have power over everything.
Certain bloodlines of witches and warlocks have found the power of Runes and thus power like Druids through branding their skin with various Runes; a dangerous and possibly fatal endeavour.
Witches who can siphon magic appear in The Tree along with several other witches and warlocks.
*Thank you for reading. I hope you've found this informative. Don't hesitate to comment and vote. For more, go to my blog Ronel the Mythmaker and learn all you can about these fascinating beings.*