My money's on either Chiyo or Sakaki

Chiyo has the makings of a class traitor for sure.

-sakaki loves cute stuff, and probably wants to be an ambientalist

-ayumu knows about unexpected stuff, so she probably has read all the books of das kapital and she knows how marx wanted to end it

-chiyo is a petit-bourgueois studying in burguerland, so she probably will be an alt-righter