Lix sent us all messages, and I replied, but I might as well make what I said known here.
As for a leader, I suggested Dorian, due to him (from what I've interpreted from reading everyone's character) being the least of 4 evils.
Lix is not the best in combat, nor decision making.
Mura's personality seems to be a bit wild, unpredictable, and impulsive.
Also Serin is unable to handle multiple situations at once, and is more of a support role.
And Dorian mostly hidden from any focus and tends to go with whatever.
(If I got anything wrong about anyone's characters let me know so I can make less of an ass of myself)
However, another reason I suggest Dorian is that his entire fighting style is playing off whatever the enemy does or is good at. He's an expert at analyzing the situation and acting accordingly, not allowing the opponents to be in their comfort zone. Also, his semblance is can combo well with practically anything, so putting him in the leadership position would allow him to get the team into gnarly setups.
I also suggested the team name DeMoLiSh