When I lived in Kitchener I watched the majority of the Rangers games live at the Aud and there's a lot you see and notice live versus than on TV. With that said:
Maybe an unpopular opinion, but Max Domi. He's maybe cleaned up a little bit in the past few years, but I have some bad memories of him being such a little pest when he played for London. Yes, he was a great player for the Knights and I know they're just "kids" at that age, but I couldn't stand to watch the stuff he got away with. Can't remember the year, but the knights eliminated Kitchener from (a hard fought) playoff series. He scored the winning empty net goal and got right in Max Iafrate's face taunting/celebrating after the goal when Max was the only dman back. I'm shocked that Iafrate didn't drop him. What a classless thing to do.
Gemel Smith during his time with Owen Sound is a very close #2. I don't think I've ever seen a player that complained to the refs as much as him.
