Cause of Death: He was shot by the police for killing Yahiko.
Background: He was raised in a small enclosure only for cult members and was told his entire life that the more people you kill, the more were send to Lord Jashin's good graces to be saved from sin, not to mention he'd be rewarded in the afterlife for doing so. He bought it hook line and sinker. Even after he ran away from the cult for holding him down and ruling his life, he still wanted to help people end their suffering and find peace. So when Hidan returned to his religion he took the initiation-killing the residents in the haunted house by the beach.
Point of view on life after death: He regrets believing everything he was told, killing Yahiko, attempting to kill Konan....he feels like this is his punishment. When he had first become a ghost he was horrified and confused as to why he wasn't with his God but he soon realized what a pile of shit it all was and is lamenting how badly he fucked up for believing in such an impossible thing as a god. He quickly became hateful afterward and is the main reason he is at such a high level of power, especially because he started taking sick pleasure in scaring humans. Now that Kakuzu is around, that behavior is starting to dull down into a mischievous hobby rather than a hurtful obsession.
Personal Space: He doesn’t really have one so he just barges into everyone else’s when he gets lonely or bored.
Interests: He likes horror movies and loud music. Also getting on peoples nerves and frightening humans. Its a secret but he used to like reading books, don't tell anyone.
Relations With Other Ghosts:Everyone just kinda tolerates him because there’s nothing else they really can do. His relationship with Yahiko is surprisingly good. He feels guilty for killing the guy and avoids him but Yahiko seeks him out and tries to clear the air. They’re dead, might as well get over it. Nagato on the other hand is very spiteful towards Hidan, to the point where its hateful. Deidara and Kisame are the ghosts he’s found with most, however.
Opinion on Kakuzu: He keeps gravitating towards him and he just goes with it, using all his wits to try to prank and frighten the older man. He actually thinks he’s pretty cool-although he’d never admit it.