I feel like Hades/Pluto only falls in love rarely, so even before the oath he always had less demigod children than the others (and even now that the oath is gone he won't have any more for a good long while) but when he does, he loves deeply.
Hades stayed with Maria long enough to have two kids with her, and he didn't leave in between like Zeus did with Beryl after Thalia was born. I read somewhere that he stayed with the di Angelos until Nico was a toddler; I don't remember if it's canon or not but if it is I think it fits. I assume he helped them get to America because travel overseas, especially to an enemy country, was, well, difficult to put it mildly (especially considering Bianca and Nico presumably couldn't go by either sky or sea). He personally warned Maria, and from the sound of it that was not the first time they were having a similar conversation. He offered to shelter her and their children in the Underworld, to build her an entire palace. He was so devastated by her death that he cursed the Oracle. More than fifty years later he was still grieving her so much that he sent armies of monsters to get Thalia in revenge for Zeus killing Maria. He had Bianca and Nico dipped in the Lethe, sent to the Lotus Hotel, sent Alecto to get them out of the hotel, got them into school with presumably all the Mist and paperwork forgery that entailed (although then left them to their own devices, instead of sending them to camp or something). Any other god would have stopped caring so much about their welfare once they were in the Lotus Hotel, and possibly before that.
As for Pluto, Hazel never met him until she was thirteen, but it seems that Marie didn't want him around anyway (in fairness, she might not have wanted him around BECAUSE he'd left her and Hazel, I don't know which came first). But when Hazel was born he was "so pleased and proud" that he offered Marie literally any wish it was within his power to grant, and even though he knew what she asked for would only bring trouble he gave it to her anyway. He had apparently had the Levesques under his protection all this time, which I think is why Hazel never mentions ever seeing a monster during her childhood, even though you'd think a child of one of the Big Three would be a major target. He personally came to ask Marie not to go to Alaska, instead of sending a minion, but did not force her not to go. He gave Hazel a birthday present of pencils and drawing paper - which means he already knew she liked drawing, so he'd clearly been keeping an eye on her. He intentionally turns a blind eye to Hazel's resurrection, despite it literally going against his entire domain and everything he stands for as the Lord of the Dead.
the thing about hades/pluto is that (always speaking of the pjo version ofc) he does love his children. hazel, bianca, nico. he has shitty ways of expressing things, undoubtedly, but he seems to be much more into what they do, where they are, and if they're okay! he protects them even unknown to them
did hades love maria di angelo? 100%, nobody would doubt that. when he's talking to her about taking them to the underworld or the casino, she's very comfortable, they're both very mushy, the kids are not paying attention (they would be if hades being there was such an uncommon event), clearly he's been around --if not as a family, then enough that the novelty of his presence has long worn off--
did pluto love marie levesque? idk. she summoned him somehow, not really looking for him in particular, but eh, you get what you get. he clearly has been following hazel's life, but his relationship with marie doesn't look as if it was ever loving. it's even implied marie only wanted him bc he looked "fancy" and she wanted to be rich, and a "queen", did pluto love her anyway in return?
@happyk44 I’d love to hear the long version of your hc about marie and pluto (I see where it comes from, it’s an interesting perspective 🤔🤔)
[Text ID: #this made me think about my marie raped pluto hc again #he definitely loves hazel #his relationship with marie is likely way more complicated no matter how you look at it #pjo #pjo text posts #text posts #hades (pjo) #nico di angelo #bianca di angelo #hazel levesque /end ID]
I actually came up with the concept after the first time I read SoN, but forgot about it until last year. The idea is that when Marie summoned Pluto, she trapped him as well and refused to free him until he agreed to give her the wealth she wanted, which she wound up taking in the forming Hazel. Like he warned her about the weight of the curse her greed would cause, so she found a loophole that would work in her favour. Basically, "Okay, well surely a child of his would be exempt from such a curse? And if not, they would not be completely mortal and so would be able to withstand it."
So she rapes him repeatedly, which he is powerless to stop since he's trapped at her discretion. When he is finally freed, he speaks nothing of it because he loves his children and has zero interest in them being involved in any fallout once his family discovers what happened, no matter how they came into the world.
And Hades/Pluto is notoriously a "I deal with my shit on my own" kind of person anyway, so if it weren't for the fact that he suddenly comes back with a new kid with someone none of them knew about while also refusing to explain where he vanished of to for several months, they probably wouldn't have figured it out.
Persephone/Proserpina is not happy and her relationship with Hecate is incredibly strained for a few decades. She loves Hazel even if she despises her mother though. However if she knew about it before Hazel was born, then Hazel would not be born because Marie would be very dead.
I don't think Pluto is classically traumatized by the event the way many people would be (not because he's a god, but due to how I view him and his ability to compartmentalize things that happen to him), but being around Hazel can be uncomfortable at times because it's still a fucked up thing that happened to him. Nonetheless he does adore her and is reluctant to admit it when she pushes him on it as he knows it will greatly affect how she views her mother (with whom she already has a complicated relationship with).
Hazel definitely struggles with it quite intensely once she does find out. While her upbringing was difficult, ultimately she loves her mother enough to look past the abuse because she believes, in the end, her mother loves her and that is enough. But now the love she clung to in the midst of all her mother's erratic behaviour feels tainted. She is an active, living reminder of an atrocity against her father, and, when compared to Nico, who was an outcome of love and consent, she feels tainted too.
I wrote a couple fics about it a while back as well.