Mordekaiser "The Ungankable"
Juggernauts are classified as champions with a combination of good offense and good defense at the sacrifice of mobility.
Their lack of mobility is what allows players to capitalize on mistakes made by them and catch them out when they are at their most vulnerable and coordinate with an ally to burst them down.
Nasus, Garen, Illaoi, and Darius are all juggernauts easily punished for poor positioning.
But not Mordekaiser.
Because of his ultimate. An ultimate Riot previously tested with Fiora and decided, correctly at the time, it was toxic and unfair.
His ultimate makes ganking him impossible. He's solo lane and is guaranteed to be ahead of the jungle in level because of all the nerfs dealt to the jungle over the years. And so when that jungle shows up to make an attempt against Mordekaiser, Morde basically has his pick of the litter on which enemy to take out first. He ensurees that his solo lane remains just that, a solo lane and it is pure toxic bullshit.
Both being ulted by him and watching an ally being ulted by him is painful to watch because there is no helping that ally. There is no helping top lane against Mordekaiser.
No lane should have this kind of immunity against ganks.
or 
or 
? Plenty of champs have ways to avoid ganks, whether it be super mobility
, or other bullshit abilities 
.
? If she manages to catch your ally in her ultimate and is pummeling them, what can you do as many (melee) champions but stand there and hope your ally manages to escape? Are you going to charge in to the 'rescue' and give a double kill? It's the same with 
too. If he's already pulled in your ally and stacked hemorrhage, are you going to jump in to help anyways? If you do, he'll just execute your ally and then get a reset to execute you too for a double kill.