Good question. Dustin it the egghead (sometimes annoying), Lucas the "i m always correct" and i should say that mike is the more equilibrated. So i am more inclined with Lucas... i was so happy when eleven almost killed him... so you have your answer haha
My least favorite character is Steve Harrington. I also don't like how Nancy got back together with Steve in the end of the 1 season because first of all he hurt her feelings really bad and he is just not a nice person , anyways i think that Nancy and Jonathon should have gotten together.
Steve did do some bad stuff but he did redeem himself later so don't judge him too harshly. There's a new guy in Stranger Things 2 called Billy who will make Steve look like a saint and I think everyone will hate him.