i have heard a lot of people deny that Marbekah isn't a problematic ship, and if anyone ever discusses the issues it's usually about Marcel choosing NOLA over Rebekah. But never the fact that Rebekah knew him a child.
And usually the defence is that Rebekah (like Elijah) wasn't an active parent after Klaus' jealous tantrum. I admit that Rebekah didn't fraternize with child!Marcel with the sole purpose of dating him, so traditional 'grooming' definition is hard to apply.
But Rebekah never set any kind of proper boundaries between them. When he initially had a crush on her, she should have explained that they're 'family' now and that's not how it works, thus stopping his crush from going further but not drive him away. She was the adult at that time.
On top of it, Marcel grew up watching Klaus-Rebekah's messed up dynamic. He was a traumatized child who watched these stuff being normalized by two of his white guardians. And the show has never been subtle about Marcel being raised in Klaus' image, or how much Klaus & Rebekah date people that look or act like eachother.
Oh and the casual disregard for adopted kids.
Why do you think Marbekah goes under the radar for this, when Caroline+Alaric, Stelena , Delena and Klaroline are often ripped apart for this exact reason?
Does it have anything to do with Marcel being poc or is it the infantilisation of Rebekah's character?
I used to really love Marbekah. They were top 3 TVDU ships for me. But the more I think about it, the more I have to rewrite to keep loving them. And I do want to love them just because it is one of the two ships I loved that actually got an endgame. But in typical TVDU fashion, the ships that got endgames were so problematic.
I don't think anyone can say Marbekah isn't problematic. It's one thing to love them, but they are deeply problematic for several reasons. One of them will always be Marcel constantly choosing either Klaus or New Orleans over her.
But the bigger reason is Rebekah grooming him. Because there isn't another way to say it. Rebekah knew Marcel as a child, helped raise him, and then quickly got into a relationship with him. We don't really know how old he was but he was at least in his early twenties when they first got together.
For the most part, as you said, I just headcannon that Rebekah wasn't an active parent in Marcel's life. But the show actively tries to fight against that narrative. The scene where Marcel is a literal child saying he wants to marry Rebekah was meant to be cute, but it's gross considering they then have a romantic relationship. You do mention that it doesn't fit the traditional definition of grooming, but I think it does because of that scene. Marcel makes a comment about being attracted to Rebekah in a way that he wants to marry her as a child and instead of seeing Rebekah rebuke this, she is flattered and essentially gives him a goal, saying she wouldn't marry someone who couldn't beat her in a duel. Not that she couldn't marry a child or someone her brother was raising as a son. This is then paired with a flashback of them dueling when he is an adult and they begin to kiss. The fact that they are still dueling all those years later make it seem as if she had an active role in his life. Rebekah's failure to set boundaries and encouraging the crush is a form of grooming. As you said, she should have set him down and explained family. But also as you point out, Rebekah doesn't really understand healthy family.
Marcel being raised by the Mikaelsons turned him into a Mikaelson. In some good ways and some bad. Marcel definitely has a lot of similar traits to Klaus. I definitely think there is an aspect of Rebekah choosing Marcel because of that, but also simply because the Mikaelsons had to keep it in the family or Klaus would lose his mind. Even though he also lost his mind here. But at least Rebekah wasn't worried about Klaus killing Marcel like he had killed every other lover she had in the past.
Klaus stans will say he "punished" Rebekah because of the grooming, but that's really ignoring his entire character and the entire show. Rebekah took something that belonged to him, because he viewed Marcel as property more than a child. This is another reason people overlook the grooming, because people don't view Marcel as a Mikaelson or as a child of Klaus. I've always been curious of where the last name "Gerard" came from. Why wouldn't he go by Mikaelson if he was raised by them? Klaus gave him a first name but not their last name? Potentially Marcel dropped it to distance himself, but even in the flashbacks, we don't see him truly being regarded as a Mikaelson. The show did this because they understood they were walking a creepy line of predatory/incest.
I think Marbekah tends to get less judgment than the other ships because people think Marcel and Rebekah are morally superior than the other characters. This is not true for everyone, just something I've seen with both of their stans. I love Rebekah, but I get attacked if I ever criticize her for how she treated the teenagers in TVD. Or the fact that Rebekah dated teenage Matt and used money and the ability to travel to persuade him to be with her. Or when I compare Marcel to Klaus, because they do have a lot of similarities. I've noticed with a lot of characters who may have less terrible deeds under their belt get away with murder, literally. If you criticize them, people will respond with "You like x, and they've done worse," instead of holding their character accountable. Or like with Klaus, their abuse is used to excuse all of their misdeeds.
People will argue that Rebekah was turned as a a 16 year old teenager so she was a teenager and it was fine for her to date teenagers, but then Marcel being with her at 25 years old is problematic as he's an adult sleeping with a 16 year old. Or Even Damon who was turned at 24 years old. So that argument is still problematic.
I do think Marcel being a POC does play a role. POC children and teens tend to face "adultification" in media, so people are less concerned about them being groomed or taken advantage of by adults. I do also agree that Rebekah is often infantilized. I blame a lot of her behavior in TVD for that. She behaved like a child. But in TO, they matured her so much, even in the flashbacks. If TVD Rebekah was with Marcel, I think that would have felt creepy on his part.
Like I said, I do still enjoy Marbekah, but I can't think about it too much or it grosses me out. I do prefer my ships to be age appropriate and contain the least amount of toxicity we can expect from a series like TVDU.
Thanks for the ask!