Well, my husband made me know Sanderson through the original three Mistborn books. After that I read:
Warbreaker
Elantris
The Emperor's soul
The whole Reckoners series
The first two Stormlight Archive books
The three Legion novellas
The Rithmatist
Some Cosmere novellas
Skyward
I have too many favourite characters to just choose one! Right now, I think M-Bot is one of them... it's justo TOO funny!