I actually asked something to my mother before, after I showed her a recent manga chapter of Naruto and Sakura. I asked her if they look good together.
She said, aren't they siblings?
And that was where it hit me.
My mom explained that if you think about it deep enough,
almost all anime characters, look alike. They share the same 'facial features', but of course, the artist has to change the colors and shapes of those features so the readers can understand the story, and distinguish who is who among the characters.
They were
all drawn under the same figurine/sketch, and that is why, if you change
some features about Sakura, she would look
close or maybe even the same with Naruto.
Some anime has done similar things.
(My mom has this otaku eye. It runs in our blood.

)
Karin and Sasuke...Karin and Karui...Karin and Kushina...Kushina and Karui...
They look the same because of the reason stated above. I don't believe other artists are making characters for Kishi-sensei, so yeah. Maybe, there is, but they have to keep Kishi's art of drawing characters, such as spiky hair, and large eyes.
Even if the three girls above have red hair, it doesn't mean that they are related.
Even if both Karin and Sasuke have the same spiky hair (with Karin's just longer), that doesn't mean that they are related by blood.
And, as said by others before me, Karin was just an orphan who was found by Orochimaru.
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QUOTE
I was thinking Nagato had a better chance of being related to Kushina instead of Karin.
I also thought that too. But, I thought of that theory with Yahiko instead. He does come from a village that is nearer to the Whirlpool Country. Heck, I even thought that they were somehow siblings, because of the red/orange hair (now, this is supported by evidence

-- it is a possibility, since remember how Nagato gave in so easily to Naruto, maybe it's because he looked so much like Yahiko.)
Yahiko can be...uhm...Naruto's uncle?
It's a possibilty!

But, of course, I'm not saying that it's true as well.
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Edited by Shadowmoon-Sakura, 27 June 2009 - 01:40 AM.