No talk about Rammus? No real talk about Olaf? No one even mentioned Elise?
Rammus- ball OP at first alter battle, knockup/chase/get away. Late game he gets a 3 second taunt to make ADC kill himself, ball to ensure no one gets away built in thornmail and an ult that deals dmg to towers.
Olaf- True dmg is annoying AF if you level it first and it's pretty hard to out dmg true dmg early game. Amazing jungler, gets better the lower life he gets the more he hurts making 1v1 scary even if you seem to be winning. Built in life steal and attack, a 3s snair as they run away. And of course ult, making him tear anyone apart or able to run out of ganks.
Elise- Map was made for her, she does %life dmg, has a bush check and attack speed boost to takeout turrets. %life dmg means you can build really tanky and still put out stupid dmg, also torch is like made for her. Her attack speed makes her able to solo turrets earlier then most others, of course not talking full life turrets. I easily avoid many deaths by jumping over walls onto jungle or even creeps being able to avoid or chase after they flash away with low life. It's saved my life and allows decent ganks, chase and 2s of non-targetable. Built in hourglass? If you get both you stand there like a tard but then can be full life when everyone else is half life.