I'm going fucking insane over Jayce & Viktor so I offer you an unhinged ramble about the butterfly and the narrative structure of their relationship. I apologize in advanced for being batshit.
So Viktor and Jayce's relationship is a chiastic structure. A chiasm is where the beginning and end of a story point to the middle of it, creating an X or ∞ (a chiasma is also a structure in genetics, if you've seen the word in science classes before.)
This means that the rise and fall of the narrative mirror each other (parallelism). There are many parallels in Jayce and Viktor's relationship, with one of the most overt being "Am I interrupting?" and one of the more covert examples being Viktor's belief in Jayce's dream to use science to bring access to the Arcane ("Our hextech dream") and Jayce's belief in Viktor leading them to shattering access to the Arcane web ("We finish this together.")
At the center of this narrative is death and resurrection (metamorphosis). The first season ends with Viktor's death, and the second begins with his resurrection, the literal center of the story.
Now, Arcane is about love in its entirety. All-encompassing, earth-shattering, life-giving, life-taking love. Love, which inspires our greatest evil and our greatest good, is something that changes us. Love which can lead to grief, can make us into our worst selves (consider the warmongering), but it can also make us into our kindest selves (consider Isha.)
Jayce's love for Viktor saves him but it also changes him. Twice. When Viktor dies, Jayce is unwilling to let him go and uses the hexcore to resurrect him. This transforms Viktor into the Herald.
When Jayce is forced into the alternate reality where he experiences the decline of his body and the struggle to climb from the depths to the surface (a narrative representation of empathy), he finally understands Viktor. This transformative understanding primes him to fulfill his promises to Viktor, past and future - to destroy the hexcore and stop the Arcane from bleeding out all over reality; to save Viktor.
The butterfly is a well-know symbol of transformation, so it's no accident that it follows Viktor and Jayce from the very beginning to the very end. But it isn't just a visual representation of love and its power, but a reminder of the very structure of their narrative.
Because Arcane is also about perspective - narratives. Silco and Vander show us how our shared experiences can yield different motivations, as do Jinx and Vi, and Ambessa and Mel too. Every single one of these characters is motivated by love, but their methods are opposing forces.
We see, time and time again, that those with the most power are those who control the narrative (power in Zaun creating a righteous rebellion vs power in Piltover creating a narrative of dangerous insurrection), and that power lacking empathy is corruptive (Cait and Ambessa forsaking empathy in favor of violently seizing control vs. Vi and Mel embodying empathy to save that which they love.)
At the center of all of this conflict is partnership. Failed partnerships, like Vander & Silco and redeeming partnerships, like Ekko & Jinx. Viktor and Jayce share a dream, and that dreams bleeds the Arcane, corrupting reality. But when they forsake their partnership (Jayce joining the council and Viktor leaving the lab), it nearly destroys everything.
When they lean into their affection, when they utilize empathy, when they let their love be transformative, they heal the Arcane and reality. In their final moments, they mirror each other, and as they're scattered into all timelines and all possibilities by the explosion they are transformed into something cosmic together. Their story ends as it began.
We know from the lifecycle of the butterfly, by the structure of the narrative, that beginnings and endings are not so finite. Love is both a constant ("in all timelines, in all possibilities") and an anomaly ("That which inspires us to our greatest good, is also the cause of our greatest evil".) It is the infinite, and the infinite is not a line with a beginning and an end, but a tangle of time and potential.
The chiastic structure of Jayce and Viktor's relationship is one that shows that love itself is the most powerful and transformative force in nature. It demonstrates that love doesn't just have the potential create or destroy but to do both at the same time; that reality isn't binary, but it is symmetrical. A butterfly was always a caterpillar and a caterpillar was always a butterfly; it experiences both, not one or the other (there's even a moment where it's neither and both all at once!)
Love is imperfect. People are imperfect. When Jayce is transformed in the depths of Zaun, he finally understands this. He carries this revelation to the height of Piltover where he finds Viktor waiting for him.
"There is no prize to perfection, only an end to pursuit."
If love were perfect it would stagnate, dreamless. Recognizing its power is seeing it for all its good and evil, and choosing it all the same.
"You were never broken, Viktor. There's beauty in imperfections. They made you who you are. An inseparable piece of everything I admired about you."
Viktor's transformation isn't from a broken man into the Herald, it's from a man believing himself unworthy of love to one knowing he is loved unconditionally. If love were perfect it would require perfection of us. But it isn't and it doesn't. Only Jayce can show Viktor this, because Jayce loves Viktor and Viktor loves Jayce.
"I thought I wanted to give magic to the world, but all I want is my partner back."
Think about Singed telling Viktor that "Love and legacy are the sacrifices we make for progress."
And Viktor responding, "Jayce will understand."
He did understand eventually, only he sacrifices progress and legacy for love and transformation. Love is not the opposite of progress, perfection is the opposite of progress. In a perfect world, there is no need to dream together. Jayce understands this. He shows Viktor this. And together they change.
I've always been bad at concluding paragraphs, but I hope my rambling has made sense up to the point. TLDR; the butterfly is a visual representation of Jayce and Viktor's narrative as one of love and transformation.












