If u are in bronze or silver, play - jax, tryndamere, kayle, yasuo, rengar, kha zix.
If u are top laner or mid laner pick caitlyn and play like a bitch. Farm and place traps and harass. Use ur e only to escape/dodge spells and make the enemy laners life hard. Ur early game will ruin enemys early game. For example if its a mage he will have to use a lot of mana to farm if u push him under turret and he will not have kill potential on u. If u accidently trap him, hey half his hp bar gone.