Orochimaru

[2] He was once named Yashagorō (夜叉五郎) and was one of Jiraiya's followers but was overtaken by serpent magic.

Having changed his name to Orochimaru, he gained the ability to turn himself into a giant serpent.

He poisoned Jiraiya and Tsunade the slug princess by pouring his venom on them as they slept, only for another follower to save the couple's lives afterwards.

In the 2013 video game Muramasa Rebirth, one of the alternate endings has the Iga ninja Arashimaru getting possessed by his final opponent's spirit and taking on the name "Orochimaru".

In a desperate act of defiance, Arashimaru's ally Shirohebi has the ninja's former master Shiranui spirit away a rival clan's last surviving heir during Orochimaru's attack who, when grown, takes on the name "Jiraiya" to fight Orochimaru.