Hello novice
Well, Canada is the closest neighbour for the USA, and a lot of trading occurs across the board. So USD/CAD has different behaviour than majors.
You are right, it is good for diversification (as any other currency pair).
Speaking about AUD, I think it is more correlated to CAD than EUR. These two non-major guys are often called "commodity currencies".
JPY may be difficult sometimes, however TA works as usual. You may just consider BoJ as a biggest "bull" participant.
Take care and have fun
