Considering your stuffed even if you try to save the species I'll go along with an all-time list that is interesting. Don't know if I can top the battle of Hittler, Jesus, Buddha et al (that was funny shit)
Malcom X
The Guy who founded KKK
Michael Jackson
Chairman Mao
George W Bush
Friction everywhere there. KKK Man would not get along with X or Mao, certainly would with Bush, possibly with Jackson as he changed the colour of his skin.
X would detest all. Jackson would be trying to molest all of them. George W would launch a pre-emptive strike on Mao and Jackson (he don't want his ass terrorised). George W would form a "coalition of the willing" and take out the threat of Malcom X. He would do this even if he likes black folk, because he wouldn't be able to make the decision for himself and would do whatever his KKK friend told him to do.