Hate the family member/friends/partner/pets twist. Very few have been great housemates, but most have been awful. They have the same obsession now with this crap twist as they do having the diary room in the same area every series these days.
Ziggy's dog BB8 visiting and any other housemates visiting pets.
Samanda BB8
Nicola BB9
Dave's wife BB11 visiting
Steve's wife BB11 visiting
Jem BB12
Lisa BB9
Mario BB9 and would've been even better without his wife, Kenneth BB10 (Karly was fortunately evicted same night he entered), Isaac BB10 and Shannon twins CBB9 were the only ones I can remember that were great.