Full AP
has amazing burst with that true damage ult. His lane phase is a bit of a struggle if you're against someone like Ziggs or Xerath that can continuously poke you down, but he excels against assassins due to his long duration silence and disengage Q (e.g. against Zed, if he ever ults you, just Q before he reappears behind you, silence him, then walk away).
is an underplayed mid laner that takes a fair amount of skill to master. Not only does his ult single-handedly win teamfights, but the burst is absolutely enormous against squishies. It's also rather amusing to watch mages struggle against his nigh-invulnerability after getting 1 or 2 items.
Then there's
, who can literally 100-0 someone almost instantly. She has an extremely safe laning phase, but struggles to cs under turret. Not only that but her skillcap is one of the highest when it comes to assassins, however a well-played LeBlanc is truly terrifying.