I dont follow bodybuilding too much, so it would have to be the predictable Big
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In terms of strongman, Mark Felix and Derek Poundstone seem great guys and have acheived alot.
Powerlifting, yeh Andy Bolton, deadlifts my favourite lift so he stands out for his unsurpassed strength, and I like watching vids of Scott Cartwright from Supertraining gym. He has put up some big squats, and a few records.
Olympic lifting I dont know many of the lifters but would agree with your choice misha koklayev, he has done some huge lifts and seems to have a great sense of humour and personality. The accordion video is quite a funny watch.