I think everyone thought they were blond, though that's kinda our own fault for assuming things because Sanji's blond. Seriously though I don't get what the fuss is about as this is really not the first time. In fact it's rather common as OP characters always have had a large variety of different hair colors, but the chapters are drawn in greyscale colors. So every hair color, with the exception of black, are drawn like it's blond. It's a common occurrence that whenever we see a new character for the first time in color, that it looks differently than expected, but for some reason in regards to the Vinsmokes some people are more bothered by it.
I sincerely doubt though that that this had anything to do with them being genetically manipulated. As I said it's not irregular to have such hair and what does the color of someone's hair have to do with their strength? When you are planning to genetically manipulate people to make them into superhuman warriors, I doubt the hair would have priority. If it did, they all should have had the same hair, which they don't. I simply think Oda wanted to give each one of them a color scheme. I'm even thinking Oda might have used the traditional seven colors of a rainbow, one for each of the Vinsmokes (so including the mother). This has no relevance within the story though.
In the end the one who may end up having Judge's character traits is the "trash-son" he kept up rejecting. Looks like the genetical modifications impacted on their hair style more than i imagined. As majority of the fan-arts, i also always thought they were all blond and thus seeing this, it comes as surprise. Wouldn't be surprised at this point that when Judge's mask will fall, we'd realise his eyebrows also go the same way as Sanji's. As for the style in itself, what i liked about the cover is the way Oda implemented Big Mom's theme in it without herself being needed to take place in it from the background colors and the skull in the "One Piece", as well as the difference in ideals designed around Sanji and Luffy on the background as well. The germas could have been better though without those hair styles. The only one i think is fitting is Reiju
The eyebrow thing is interesting, Didn't think of that before. That could be it why he is wearing that mask all his life.
Damn I hope that is true, that would be so funny if Judge shares his eyebrow direction with his failed son.
It might be that Judge has the same eyebrows, though even if that's the case that really should have no connection with him wearing a helmet as he was already wearing it before he 'realized' that Sanji was a 'failure'. He's also the type that reasons that it's Sanji who is the embarrassing one and should be embarrassed, not him.
I theorized a long time ago, even before all the Vinsmokes were introduced, that Sanji's eyebrows were a visual representation of Sanji being 'the odd one out'. So if Judge has the same eyebrows, I think that's just Oda's way of showing how twisted their relationship is.
Like I asked then, the issue is the specific colors, and not that they're brightly colored then? In that case, why can't these colors be used for agents in an organization of assassins. What about these colors conflicts with the concept of a military organization of assassins?
Unless you can provide an actual reason such an organization can't have people that look like this, then you're talking out of your ass.
Interestingly enough, Reiju's eyebrows also see to not match her brothers'.
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Unless this is an error that Oda kees making, it might be possible that Sora tried to use the drug on Reiju too, since she expresses a degree of emotion, and that the eyebrows could be an indicator of the successful genetic modification.
That doesn't necessarily mean anything as pre-time skip Sanji also had one side of his face covered and on occasion there were panels that we should have seen the curl of his other eyebrow, but we didn't. This can easily be just a manner of convenience, something Oda does with a lot of things. For example Zoro's swords often don't look like how they're supposed to look simply because it's inconvenient to continuously draw them so detailed.
An alternative explanation is that Reiju is not part of the set. I don't think it has been specifically mentioned, though strongly implied that Reiju is a bit elder than the others and that the brothers are quadruplets. Personally though I think the former explanation is the truth as we can't see either Ichiji's nor Niji's 2nd eyebrow, at least I can't remember seeing them fully. The only Vinsmoke who permanently has both eyebrows in the open is Yonji.
And I literally explained it in that post? A group of assassins seem better suited to be portrayed darker and more organized.
Lol Riker get some sleep.
I know they were originally introduced as assassins, but seriously at this point that's not really a fitting description anymore. By all means they are mercenaries. If your issue with their hair is the compatibility with their profession, well I think there are several things far worse than their hair in that regard. Not in the least the epithets that bunch of wannabe royals don:
"Sparking Red Ichiji"
"Electric Blue Niji"
"Winch Green Yonji"
"Poison Pink Reiju"
To be honest Oda gave it away a while ago, we just didn't realize it.