How to get out of Elo Hell with Mundo and Kayle.
Top
Mid
-Now, the reason
is so good is because he never dies if you're good with him. He can dive in towers and he deals AOE damage all the time. AOE is very good vs clumped-up bronze players. Bronze players will duck in towers even when they can't defend it. With mundo, you can get an easy kill for that fact when you atleast got an other friend nearby. Mundo don't even need kills to make a lot of gold, he can push lanes very fast and you need a good lane pusher in bronze.
Mundo can initiate ganks with his Q and that can help you get kills on your own as-well; you're not always dependent on friendlies which is good.
With mundo, you can chase an ADC or initiate on an ADC and make sure he's the first one to fall.
Finally, by the time you're level 6, you're not supposed to die, ever.
With
, first off in bronze, you need mobility. So don't pick a mage who is not mobile at all; i've tried. Supports and other players don't ward often enough so you need mobility in order to farm further away from your base consistently. If you can't farm because there's not enough wards, you're most-likely gonna lose.
Kayle got a good escape for a mid champ: her heals makes herself or an ally move fast so you don't have to waste an ult to survive; keep that ult for ganks.
Kayle can attack very very fast and her E deals AOE damage around the target. This is good to push-lanes fast and to take down towers. Later on, that will make you become an unstoppable carry.
She never fails to initiate a slow since it's a target based ability.
With her ult used on yourself, you can attack fast with AOE damage for 3 second while standing still. For 3 seconds, that's a lot of AOE damage against clumped-up bronze players.
Bronze players always forget that your ult makes you become invulnerable for 3 seconds, so they go all in, thinking they're gonna win the duel.
Kayle is a good semi support who never dies in bronze if you play it right.
Finally, since you can push lanes so fast, it means you have a lot of free-time to go gank early game. The more you can gank, the more chance you give for your team to win.
Who to ban?
Request a ban on
, always. Bronze players can't deal with a nasus, they will let him stack. Sometime, a top ally vs nasus will leave his lane to gank which mean, nasus will stack-up for free. Even if you, youself, you're up against nasus, your allies will jump on him when he procs his ult and that's the best way to lose.
I once prevented a nasus from farming too much. He only had 150 stack for a long time. Yet, he had a lot of kills in the end. We still won the game. The support let the nasus kill him for free. I asked him why. He said, to bait him, to make me become fed. /facepalm... i fail to see the logic of these bronze players sometime.
Always request a ban on Nasus, always.
Ban 
Bronze players always, always take the bait against an Ekko. Request a ban on him, always. It's not impossible to win against an ekko in bronze, but it's a risk. I've seen an ekko killing 4 of my allies on his own. We still won the game, but i no longer wish to see him in bronze.