Hidan was also the member of Akatsuki. He was the practitioner of the religion of Jashin. Lord Jashin gave him the ability to transfer his pain and wounds to the target by performing a ritual. Thus, even if his head was separated by his body he would still be able to live as we saw in the Naruto series. It is unknown whether he’s dead or alive.
Orochimaru is one of the legendary Sannin of Konohagakure. He wanted to learn all the jutsu that exists in the world. So, in order to do so, he invented a way to gain immortality. He can transfer his soul from one body to another. The stronger the body more powerful techniques that he can use. Orochimaru is still alive and well.
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