And its kind of sad Blitcrank didn't get into the show. Because had the show kept the "Arcane in a neutral force" narrative of S1. Blitzcrank could of been a great addition to the story.
Picture this instead of Jayce using the hex core to heal Viktor at the start of S2. The Hexcore connection to Viktor allows it to gradually heal him even when he's not near it. And so he has small glimpse of the Arcane and Sky here and there but nothing big as he was in S2.
(We can also have ep.1 of S2 be an act in of itself). Where Vi has more time to question becoming an Enforcer. I also think we could have an interesting confrontation between Viktor and Vi about the usage of weapons. However this comes to a turn when "The memorial attack comes about" (Maddie protects Jayce during the memorial) and so push comes to shove Vi needs Viktor's help to get to the lab and fix up her gauntlets (Which gives us more hints of his connections to the Arcane thanks to the Hex-core).
And from here this has Ambessa have Rictus become the personal body guard of Jayce. And Viktor give's the Ok for Jayce to build weapons for the strike team he assembled.
And from here Viktor and Jayce recognized how bad it has gotten in Zaun if Violence was the thing that needed to solve the problem. (We also have Jayce reflecting how the women is the mom of the kid he killed). And so they decided that they need to refocus their efforts on giving Hex-tech the people. And so decide to invent something that will help rebuild the under-city. And Viktor got an idea of what that can be after he sensed the arcane coursing through Vi's Gauntlets.
Hence forth they go and create Blitzcrank.
And while Viktor is dealing with making Blitzcrank and having him continue his legacy when he is gone, on top of dealing with the grief of Sky's death as he reads more of her journal and as he try's to follow her wishes. Jayce is focused on helping Mel rebuild the Council while at the same time preventing Ambessa from obtaining more power. However he is still manipulated by her. On top of that he is trying his best to find a way to break the Hexcore, however hits a roadblock whenever he try's to break it he harms Viktor. And so he has to deal with Viktors life now being in his hands.
However things come ahead when Caitlyn starts using the Grey (This time around its not the first thing she do's but rather something she do's later on.) This prompts Viktor take action with Blitcrank to try and solve the mess. And here he is trying to create a legacy for himself by using Blitcrank here. And in Viktor dies. And here with all of the pressure from both Ambessa and Viktor, Jayce uses the hex-core to cure Viktor. Which has Viktor build a much deeper connection to the Arcane (We also get a flashback to him and Sky interacting again, this time their in their tweens).
However as Viktor is in the cocoon, a lot of people believe it to be that Jayce made Blitzcrank. Leaving Viktor's legacy in Jayce's shadow once more. On top of Jayce going in making more Hex-tech weapons. So he sends Blitzcrank to leave so that he doesn't become and weapon allow for him to choose his own fate.