I don't think a housemate should be defined by their length of stay in the house. A big character can have a bigger impact after two weeks than a small character will after 100 days. I think a big character is a housemate who the public either loves or hates. The smaller characters are the housemates who the public can't be bothered forming an opinion on. It is undeniable that Tully made a big impact on the show last year.I agree she was a bigger character then the people you listed. But the sugar sisters did last a week more then her though but that was only because the public voted for them to get Tully out. Then they were gone after that. Which makes me think about why should Tully should be classified as a big character. As the voters made a plan to get her out. my personal opinion is the show got a lot better after she left. also Without twitter I probably wouldn't remember her
At the end of the day it is pointless to debate this any longer. I think we can all agree that we were lucky last year as fans of the show to have so many memorable characters whether you loved or loathed them like Tim, Tahan, Mikkayla, Ben and Tully.