Would easily be Northern Pike. After catching my first one in Canada two years ago Bass fishing has really not been fun anymore compared to the battle I had with that fish up there. Plus they are just simply majestic predatory fish.
surprised noone said anything bout a salmon? I know they get oceanic but this is dreams and if they could be freshwater mating colors all the time that would be a crazy looking setup!
Either arctic grayling or Alaskan blackfish. A fully coldwater setup with four horn or deep water sculpin, arctic grayling and some fallfish would make an awesome display.