Board Thread:Versus Debates/@comment-27202380-20151125000104/@comment-734582-20151128124808

I want to take a moment to point out that red hair is characteristic of the Uzumaki clan. Combined with a naturally stronger chakra, that's pretty much all Tobirama needs to know Karin is Uzumaki.

Secondly, Chakra has been explained to be "colored" before. But there are millions of colors to be distinguished. Having Transmigrant chakra doesn't color your chakra deep in that transmigrant color, but it is rather a mixture of your own and the Transmigrant's. It's also said to be a recreation, not just something passed down. It's not that a Transmigrant births a transmigrant and so on. The chakra fragments occasionally come together to recreate the original chakra. But that doesn't make it a copy, it's a different chakra that has characteristics of the original.

I think that the whole Rinne Sharingan to Rinnegan/Tenseigan thing with Kaguya, Hagoromo and Hamura proves that chakra reacts differently to different people, and so every transmigrant is different yet in some way the same. They're clearly unique enough to be considered individuals.

Lastly, as i said before, Naruto and Sasuke could be the exceptions. Sasuke was experimented upon by Orichimaru, carried the Curse Mark and had Juugo's essence infused to heal. Naruto had Kushina, Minato, Yin and Yang kurama, and 8 tailed beasts in him. His chakra signature must be an absolute mess compared to what it used to be.

Therefore, you may be right in the other 99% of the cases, but it may just be that Sasuke and Naruto are the exception to the usual rule.