Champion that could be Disabled for LotPK
As for the champions I have played so far, the most worthy of disabling are those with strong and safe poke.
I suggest Xerath and Varus for example.
First, Xerath
has one of the longest non-ult ranged abilities in the game so he can safely stay in the back line while dishing poke and recharging MP with his passive and the relics. His Q is much more reliable than a Nidalee Javelin and has similar damage. I see that a lot of unskilled players are using him badly though.
Second, Varus
is in a similar situation, only his damage is physical.
These two combined in a game are a difficult to counter combination. However, on wrong hands these two could also be the most useless champions for not exploiting range advantage, and such players should never even consider joining the military.
I would just consider that their poke is too strong for this game mode.