I say Kaname or Zero, and or both.
I cant see everybody dying, it'd be a rubbish ending then, thats why they are re doing Evangelion for because literally everybody on the whole planet died except Asuka and Shinji.
Same with X Movie, people said that was rubbish and again literally everybody on the earth died except Kamui, dont know if they did the series or nor because people dident like the movie or not but... theres a revamp to X.
Hmm... i will also think .. Cross will die to ;-; he is loved so.... also maybe Yori to? after all she IS the protagonists best friend.