The Discworld series by the fantastic Sir Terry Pratchett
“ 'I'm not a lady, I'm a witch.' ”
"Witches are not by nature gregarious, at least with other witches, and they certainly don't have leaders. Granny Weatherwax was the most highly-regarded of the leaders they didn't have."
“Esme Weatherwax hadn't done nice. She'd done what was needed.”
Though I love pretty much all of the characters that make up the (20+?) Disc wold universe, I have a special place in my heart for Granny Weatherwax. She is plainly and happily herself. She can be fearsome when she wants to be, or frightening, but most of the time she's a no-nosense old lady who prefers to use "headology" over magic unless it's absolutely necessary.
She can borrow animals' bodies and uses them to travel and see places she wouldn't be able to as a human. For those times, she lays on her bed with a sign that reads "I aten't dead" as a precaution, lest anyone think she has passed away. Spelling is not one of her strong points, but it's probably because she hasn't considered it necessary to spend time on. If you're not familiar with Discworld, I encourage you to start reading. This chart is helpful, if not completely up to date, to give an idea of where to start.