Thank you for the warm welcome
Mistborn was the first of Brandon's books I've read, so it has a special place in my heart. I liked that we got viewpoints of the different characters and got to see their varied struggles with the final empire and what followed, how they kept going despite all the setbacks. I particularly liked the relationship between Vin and Elend at the end of the trilogy.
Also, I love well defined magic systems. Especially with Allomancy and Feruchemy, Brandon is the master of telling us all the rules and then finding ways to apply them in new and surprising ways.
And finally, I love listening to Michael Kramer narrating the audiobooks (also in other novels, expecially Stormlight together with Kate Redding).
It is hard to tell who my favourite character is, it usually changes depending on what I've last read. But one of my all time favourites is Jasnah Kholin.