If I remember correctly, Dove comes from a niktuku lineage but isn't niktuku herself. It's a bloodline with strange quirks.
They Can only eat kindred blood, the one with a weakness we know of (nukeleve and running water) is a folkloric bane and when embraced they are stupidly beautiful and get uglier as they age (very unlike Nosferatu who become ugly and get even more ugly).
Best way to think of it is that the matriarch and Baba yaga are from absimilard like the niktuku but are Nosferatu instead.
Which is why she's ugly and doesn't eat kindred. Her sires just a dick.
Unless they have retconned the niktuku just for night road.
Honestly I think it could still work within the lore established for Nictuku because "omg!!! they eat people!!! THEY EAT BABIES!!!" is a popular pre-modern propaganda for enemies. It would not surprise me at all if Nictuku being cannibals was a complete lie, or just a myth. It could simply be that the Nictuku don't have the same taboo around diablerie and everyone else freaked out and took that as being the same thing as a "requirement." Or maybe you only require vitae while you have an active blood bond with Absimilliard, which I can't imagine every single Nictuku descendant has. It may be that being blood bound to an Antediluvian does fucky things to your biology regardless of bloodline.
However I do believe that if Dove really was just a normal Nosferatu who happened to be a genetic throwback, the game wouldn't be emphasising her ugliness so much. She's said to be hideous even by Nosferatu standards, and the game goes out of its way to explicitly state her lineage, so I think it's quite deliberate. In fact, part of her backstory is that her sire, Modian, found her so ugly that he abandoned her on the spot. His official excuse was that she "wasn't really his", but like, dude, he was there when she was Embraced, he knew that was bullshit. My thinking is that Dove resembled their Nictuku ancestors more than he did, he was terrified it'd reveal his ancestry, and so he tried to distance himself from her as much as possible. I cannot remember explicitly, but he might have even been the one that set the Giovanni on Dove, which screams "cover up." But take that with a grain of salt, that might have only been implied and the author might not have intended that implication.
Reremouse, though, is the odd one out as he likes to chill underground and Nictuku are supposed to be claustrophobic (plus I just found out he's the brother of a character from another CoG game who hangs out in sewers and doesn't seem to be distressed by it). I'd love to know more about him. Despite Dove's shitty relationship with Modian she seems to be a lot closer to Reremouse in that she actively keeps him fed, and is genuinely distressed at the thought of his destruction. Plus the game strongly implies he's not a Wight but he's prone to Wight-like rampages? Dying to know the story behind that.
And honestly the Nictuku thing would explain why Dove doesn't seem to be attached to a Warren at all. There's zero mention of any Nosferatu in Tucson aside from Dove and her relatives. That might be because the Old Prince of Tucson massacred them, but Dove doesn't seem to be in a hurry to re-establish a Warren 10+ years later. But again, her grandsire and great-uncle like to chill underground, so that might not mean anything.
