Tank Kayn is EXACTLY the same problem as tank 
. Overpowered in mobility and damage but can build a few bruiser items, not designed for him and become pretty much unkillable. Sort this out Riot, when will you learn that assassin champions cannot be allowed to build any defensive items because it makes them unfair with their already bloated kits and numbers.
OtterlyLost3 votesTo be fair, Red Kayn is intended to be a Bruiser. Not an Assassin. He has all the staples of a bruiser; decent damage, good against tanks and squishies, the ability to go in, moderate CC, bulky, excess sustain to allow him to last in fights.
That said, I do think Red Kayn perfectly illustrates the over all problem with bruisers. :/ They are jacks of all trades and when you have to choose between playing either a bruiser or an assassin, the one people overwhelmingly pick everytime is the bruiser. Because the bruiser can do everything an Assassin can without being half as squishy.
Quiet Dude2 votesKayn is only popular right now because of the Odyssey stuff. Wait till its over and he will go back to being a niche pick.
But I also think tank Kayn should be a thing. Rhaasty boi is a front line fighter who scales well with juggernaut items.
GreyfellD2 votesI think Kayn is a toxic "modern" design in League, way too much mobility crammed onto everything, overpowered damage and very very few weaknesses.
Quiet Dude1 votesOk
iPooUnicorns2 votesKayn is mobile? lmao
DuskDaUmbreon1 votesDash on Q, targeted pseudo-dash on R, and huge MS buff+Ability to walk through walls on E.
That looks pretty mobile to me.
saltran2 votesWtf
ShadWooo1 votesWhen an offtank red Kayn does 2500 damage to squishy in 3seconds (2 Qs) and then ult and heals full hp, then why would anyone go blue kayn?