1. Because she looks like a badass when she smokes a cigarette.
FX / Via dead-foxy.tumblr.com
SHE SMOKES LIKE A CHIMNEY.
3. She has a discerning eye when it comes to fashion.
FX / Via scurrymovies.tumblr.com
And isn’t afraid to show it off.
5. Fiona also has a nasty sense of humor.
FX / Via taraknwles.tumblr.com
Get it? Because she’s a witch?
8. She loves to take charge of a situation.
FX / Via ahorrorstorycircle.tumblr.com
10. Her Halloween costume WILL be better than yours.
Don’t even bother trying.
11. You know she won’t have any of your complaining.
FX / Via justdan1985.tumblr.com
16. She gives out murderously good decorating advice.
FX / Via heathledgends.tumblr.com
Like the witch version of Martha Stewart.
Read more: http://buzzfeed.com/samstryker/19-reasons-you-do-not-want-to-mess-with-fiona-on-9ibk