But if I was to give a idealogical foe, it would have to represent a victim of some kind. Boruto wants to bring back the age of Shinobi because he feels his dad went to far and jeopardized his nation, its culture and security, in the name of peace. Then the ultimate opposite to that, instead of some peace loving hippy like his dad, would be someone who was victimized by Konha's previous militarization and paranoia.