Hey! Figured I'd introduce myself. I'm relatively new to The Cosmere, as in I started reading Mistborn sometime in February of this year.
As for Mistborn, I've read The Final Empire, The Well of Ascension, The Hero of Ages, 11th Metal, Alloy of Law, Shadows of Self, Bands of Mourning along with Mistborn: Secret history. Yet to read The Lost Metal, I've decided to wait until I'm further into The Cosmere.
I've also read The Way of Kings and I'm on chapter 25 of Warbreaker.
I've basically been reading straight Sanderson since February (with one exception).
My favorite characters probably are Kelsier (hence the username), TenSoon, and Kaladin.