Do you have a post on the parallels between Luca/Nina and Griffith/Guts? The Rosine/Jill parallels to Griffguts are obvious to me, but I feel like Luca/Nina is a bit harder to unpack.
I thiiiink this is the best one I have on the subject in terms of like, being concise and having an actual take.
I think this is the post I allude to in the first one, which is aimless musing on the Conviction arc that includes those parallels, with this as a little followup addendum.
But neither of those posts are very good lol, the first is fairly brief and the second is rambly and bewildered, so I'll dig into my thoughts here a bit.
I agree that Luca/Nina is really hard to unpack lol, the Conviction arc in general to me is so cynical about relationships that it's hard to reconcile with the rest of the story framing relationships more optimistically. It hammers down the theme of some people being torches in the dark that other people cling to and resent over and over and over, and Luca/Nina is the main example of that, with Nina looking up to Luca and clinging to her as a leader while (presumably) remaining immature, vs Nina striking out on her own with Joachim in a more positive, equal relationship that allows her to (potentially) grow.
Nina and Luca are very overtly paralleled to griffguts in some ways, from straightforward imagery like Nina grabbing Luca as they dangle from a giant hand, to stuff like comparisons to fire ("torches in the dark" / "blazing inferno" eg), and the general thematic relationship stuff about being weak and depending on people.
But those threatened by the dark… can by no means ever let go of a torch. All they can do is stare in blank surprise at their illuminated, disgustingly cruel selves… and continue to suffer it… And to protect their stunted self-esteem they depend on it… all the while hating it.
It can easily be read as griffguts negative and even gtsca positive, on a surface level. Nina leaving Luca to go out on her own with Joachim could easily be mapped onto Guts leaving the Hawks and later engaging in a potential relationship with Casca. (And from Griffith's perspective, the above monologue from Eggman perfectly describes the second duel and everything that comes after.) But, while I'm obviously biased lol, I do think that's a shallow reading.
I think Nina and Luca, and Nina and Joachim for that matter, are better read as foils to Guts and Griffith's relationship, rather than a pure straightforward negative parallel vs positive contrast. Nina and Luca represent the type of relationship formed around like, admiration/pedestalization and self loathing.
They're a parallel to Guts and Griffith after Guts hears the Promrose Hall speech and starts viewing Griffith as a distant godlike figure. In some ways they also parallel Guts and Casca, with Guts clinging to Casca as his final "feeble flame," post-Eclipse, or the King and Charlotte with Charlotte as his source of warmth, or Farnese and religion, or maybe Serpico and Farnese, or Casca and Griffith, the RPG group and Guts can be paralleled as well, etc.
Nina and Joachim represent a more equal relationship with both parties relying on each other while seeing each other as people, rather than pedestalizing the other as a "torch in the dark."
They're a parallel to Guts and Griffith pre-Promrose Hall, Farnese and Casca, I would argue Casca and Judeau in potentia, maybe Guts and Casca in potentia, maybe like, Puck and Guts lol, yk. Mutually beneficial relationships where both help each other, both are emotionally vulnerable with each other, neither looks up at the other as a symbol of everything they're not.
I don't think the takeaway from the end of the Conviction arc is that all Nina/Luca type relationships should break up and see other people lol, since I think we've seen multiple relationships in Berserk shift from one to the other, healthy to unhealthy, unhealthy to healthy, Griffith and Guts being the central example of a relationship that encompasses both. Relationships aren't static - it's all about different mindsets. Nina and Luca and Joachim are just one way of illustrating the difference very bluntly.
A person hurts someone just because they're strong. And they hate someone just because they're weak. ... I think I'll go with this man who is burdened with the same weaknesses and sins as I.
I think the Conviction arc has a very cynical take on relationships, but yeah after considering it for a while I don't think it thematically contradicts the rest of the story and its more positive take on relationships. I don't think Berserk as a whole treats "A person hurts someone because they're strong and hates someone because they're weak" as like, an objective immutable fact, for example. It's not really about finding a person who is your exact equal because anyone else is going to be bad for you lol. But it's deinitely true when the characters have a certain negative mindset.
Like here's one very straightforward example I like to cite as a healthy vs unhealthy mindset that fits, even if it's not an interpersonal relationship: When Guts is happy and fulfilled, he doesn't care that Zodd is stronger than him. He cares that Griffith helped him. When Guts is unhappy and unfulfilled, his new goal is to become strong enough to kill Zodd, the only person he's encountered who makes him feel (physically) weak. Or like, Black Swordsman Guts absolutely hurts people because he's stronger than them and hates anyone who makes him feel weak, but that wasn't the case during his three years with the Hawks, and that attitude also hugely lessened while journeying with the RPG group.
The Conviction arc is all about how someone with low self esteem views relationships. Maybe it was the right choice for Nina to leave with Joachim and work on herself away from Luca. Maybe it would've also been a perfectly fine choice to stay with Luca while working on her self-esteem, and on viewing other people as equals who are all flawed in some way, rather than pedestalizing some and looking down on others. But as a dichotemy to illustrate a negative mindset (people as torches in the dark) vs a positive mindset (people are people you can connect with as equals) Nina/Luca vs Nina/Joachim is fine I guess.
So yeah, Nina/Luca is definitely a griffguts parallel, but they're also a griffguts contrast to the three happy years of the Golden Age, and ultimately imo they're a statement on how a relationship can become unhealthy when you have low self esteem. It's also telling that both Guts and Griffith are a Nina who sees the other as Luca, another big indication that it's about self-esteem moreso than any inherent inequality in a given relationship. Guts and Griffith could have been a Nina/Joachim, they absolutely had that potential to simply view each other as people and grow together in positive ways, but they fucked it up because of their self loathing.