is pyke unique??

Because of one ability?

He doesn't have situational MS buff, knock-up auto reset, silence or Mana shield, he has camouflage with decaying MS speed, dash, AoE stun and AoE execute, gold sharing and sustain passive, he has unique trait.

Even that one ability has different usages, If it wasn't for how far it pulls, it would feel more like Thresh's Q, even then he can pull behind himself.

One could complain his Passive is basically Tahm Kench's W Passive and his W is generic and his melee Q is generic Yasuo-style slash, but he hardly is "steroid blitzcrank".

Not to mention his passive hat turns bonus health into AD and he’s the only viable support assassin. Some might say any assassin could be played support but I don’t think it would work or feel the same because they are item dependent while Pyke can get the resistances from cheaper items while still getting AD.