So, I compiled a list of champions that the Boards hate playing against...
TOP LANE:

JUNGLE:
and basically every other Devourer Jungler
MID LANE:

ADC:

SUPPORT:

TOP LANE:

JUNGLE:
and basically every other Devourer Jungler
MID LANE:

ADC:

SUPPORT:

You forgot her.
This dude is more overloaded than my storage space for ~~ my porn~~ my notes in college.

You're winning, suddenly someone who isn't you gets hooked before the decisive teamfight, GG game lost, you deserve your -LP.
You can add Soraka to the support list. She seems to be unpopular atm (for ppl that refuse to use an assassin against her).

Missed a few
I hate when an enemy Vayne always has Vayne to peel for her.
You should just put every champion in the game on that list since people will complain one way or another.
You forgot 
You forgot the cancer kitties.

this cun* who is in every game and makes me wish i didnt have any minions
Wheres
? And
?
you forgot a support 
Where's
? Everyone hates Teeto.
When people complain about Yasuo,fizz, Zed when they are more balanced than LeBlanc.