From distance Jenos can't do much damage but he has cards that reveals enemies shot by him for a short duration. That's not all, at close range his Void Grip ability can grip even stealthed enemies
Furia is strong against Lex from long and short disrance. As long as Furia heals are good Lex wins only with damage shooting from weapon. If she uses her skills reasonably and he'll be catched with beam Lex won't have chances to win solo fight.
Not much to say here, Buck has a huge hitbox so he is easy to hook, his attacks are pretty weak as well so if you hook him between you and your friends he is cannon fodder. Take Cauterize to absolutely crush his dreams.
In order to avoid his snake stun, use your escape ability to the left or right. Don't draw back, since his snake travels much longer than his LMB attack.