Robert ‘Bobby’ Singer, until his demise, had been an essential character in the lives of Winchester boys. He was like a father figure to them, probably knew more about Supernatural more than anyone the Winchesters met( Pre-Season 4). Bobby Singer’s first appeared in the Devil’s Trap and has been a fan favourite since then. But Bobby wasn’t supposed to be an essential character. It all came out of the blue. Bobby Singer’s name is taken a producer because the Supernatural team thought he’d be a guest for just an episode. This was the reason why they didn’t focus on his name much.
Fun fact: John Winchester was also supposed to be a 1 episode(Pilot) guest too.
Even though it came out of the blue, fans still adore Bobby Singer’s name. But he wasn’t supposed to be in Supernatural, at all. Actually, Loretta Devine (Missouri Moseley) was not available for the show that time due to some personal problems. The Winchesters needed someone to aid them with all the Supernatural knowledge and Missouri Moseley was supposed to be the one to do it. But because she was not available, they had to cast in Jim Beaver.
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After some episodes, the fans liked seeing Bobby in Supernatural, thanks to jim Beavers superb acting. The creators sticked to that. It was a great decision by the team of Supernatural to create a character like Bobby Singer. A character who hunted along with John Winchester and later helped his sons to save peoples and hunt things. Bobby went on to become a father figure and a mentor to the Winchester brothers. He managed to survive many monsters and demons by eventually met his fate in season 7 of Supernatural. Even after his demise, Bobby still tried to help the Winchester brothers, though. Ain’t that a great thing?