Ok so I lumped this on the discord earlier but there was barely any grammar and most of it was just repetitive rambling. I decided to rewrite it for myself but also because I didn't wanna let that paragraph of autismsplaining go unheard. So yeah. Enjoy.
In the comics it's Homelander that rapes Starlight, not The Deep. (It was also A-Train and Black Noir, but for the sake of this post we'll forget that.)
As we all know, The Deep alone assaulted Starlight in the show, and there are a few reasons I'm guessing they changed it. The main one is that if it were Homelander, it'd reveal that he's a bad guy too early on. In the first episode he's made out to be this perfect hero, maybe even the "one good supe", and then he lasers the Mayor of Baltimore's plane in half at the end and it all goes downhill from there. Although it would make Starlight's side of the story worse/more interesting with her inability to speak out and the realization of how far Vought is willing to go to keep profits, I can understand why this just wouldn't work.
So they changed it to The Deep. I could be reading too far into this, but I'm guessing it was him specifically because in the comics he seems (or seemed, since I'm still just past Herogasm) to not really have a storyline or even personality of his own. I can only remember him even talking once or twice. Other than Black Noir until that god awful plot twist, I'm pretty sure he's the only member of The Seven who you never get to learn anything about. They could've turned him into the real "one good supe" bar Starlight. They could've given him the Jack from Jupiter treatment and replace him with an original character. I guess they didn't wanna do the latter twice, which is fair. So to make him both a more significant character and more believable villain, this is what we were given.
Yet even with Homelander and The Deep's switched dynamics (probably not the right word), they still wanted to include the whole Ryan plot. For this reason, and I'm guessing this reason only, Homelander too was written as a rapist.
What I always found strange about this is that Homelander showed no signs of that sort of behaviour before or since Becca. I know they kind of needed him to be "that guy" so they could include Ryan in a comic-accurate way. Like, what's more realistic, Homelander settling down with a nice happy family or him gaining the female validation he craves by force? But still, that part of him is always jarring to remember.
I feel like this could've been done a lot more effectively if they delved deeper into his relationship with Stillwell. The reason people so often forget that she groomed him - or don't realise it at all - is because it's just never discussed. It's implied, mentioned in passing out of the show's context, but never actually spoken about. So often I see their relationship reduced to "haha mommy kink breast milk needy good boy." And to be fair, that's basically how it's portrayed in the show. I just wish that it wasn't. Anyway, I'll probably do a whole post about that in the future. I'm getting off topic.
What I'm actually trying to say here is that they probably almost gave The Deep a child instead. It would've made sense, including that aspect of the comics but changing things up again like usual, giving the child to "the" rapist character instead of creating a second one just for the sake of it. Again, I understand why they didn't go with this.
I mean, he wasn't a main antagonist in season one. And not once has he been considered a supervillain. It's more obvious as the show progresses that he's basically just comic relief (another thing I'm a little pissed about but I digress). And since his powers make him more of a glorified human than an actual supe, it would be harder to make his offspring a significant plot device. Ryan is a threat. A ticking time bomb. I'm very excited to see what they do with him in season four. But Kevin Junior? I mean, what would there even be to worry about besides toxic masculinity and an inherited case of body dysmorphia? The only thing this hypothetical kid would be good for is a redemption arc, and it's becoming increasingly clear that the show either doesn't want that for The Deep, or is saving it for the milisecond before his gruesome death.
If this was the original idea, I understand why it was kicked. If it wasn't, it's still kind of a missed opportunity. I really think it was an unusual choice to have Homelander rape Becca. Then again, there's the whole controversy over whether he actually did, but I'm not gonna get involved.