No. Vampires are fiction - that is not real - whereas Jack the Ripper was a real person.
Jack the Ripper's identity has not yet been determined, and may never be.
No.
As 'Jack' has never been identified the question is impossible to answer.
Since Jack has never been identified, it is rather difficult to attempt an answer.
She was the 5th believed to have been killed by Jack the ripper. She turned to prostitution when her husband died in an explosion.
No, Robert Downey Jr. did not play Jack the Ripper in a movie. However, he portrayed Sherlock Holmes in the film "Sherlock Holmes" (2009) and its sequel, where the character of Jack the Ripper appears as part of the storyline. The role of Jack the Ripper has been played by other actors in various adaptations, but not by Downey.
That is unknown because it is not known for sure who Jack the Ripper was. The question of his profile is still asked today.
There isn't one. The case has never been solved.
To the best of my knowledge there has never been a woman undertaker that was an accomplice to Jack The Ripper. It is more common for JTR type killers to work alone.
Most of the Ripper's murders were found in one small geographical area, about 1 square mile, in London's poverty-stricken east end. But there were other murders outside that area around the time of Jack The Ripper's killings that have not been ruled in or out as Ripper murders.
Actually they did. Under the command of Metropolitan Police Commissioner Charles Warren, dogs were brought in but could not follow the trail of the Ripper. It was an embarassment for Warren and Scotland Yard.
That's Hollywood. Nobody knows if Jack The Ripper wore a cloak or anything else. Cloaks were popular men's wear in the Victorian Age so I can imagine that is where the cloak and top hat image came from. Unless a bloody cloak was left at one of the crime scenes there would be know way to tell what the Ripper wore. In all probability, the Ripper would have worn clothes that would have let him blend in. The alternative would have been detection.