[100gwand]

Based my opinions after going through the list of housemates from the Wiki page of their respective series...

BB4 - Federico or Scott
BB5 - Becki
BB6 - I didn't forget any of them, even the 'boring' ones.
BB7 - Michael (always forget what he looked like)
BB8 - David or Amy, probably David. I randomly remember a scene with Amy in bed with Samanda, and she said it "smelled warm". I don't remember anything about David.
BB9 - Maysoon (one of those housemates who was destined to walk)
BB10 - Tom
BB11 - Laura
BB17 - None (Not Victoria, because I remembered that Victoria and Emma were twins)
BB18 - Mandy or Simone (I forgot what Simone looked like, so I Googled. All I remember is someone making fun of her clothes and jewellery. I remember watching Mandy's eviction for some reason, but that's all)
BB19 - Kay or Isaac