Rougher than the rest of them, the best of them, tougher than leather. In EXE, Knuckles is portrayed as a bit more stern and aggressive than we’ve seen him in the recent games. Dude argues, fights, then he dies. Doesn’t mean he’s not cool, though. If you had to base your portrayal off of an actual in-game performance, I’d go for a more Dan Green-inspired take, as I feel like he was the best at portraying an angrier Knuckles. Although like I said with Shadow, it’s not a requirement. Do your own interpretation or whatever, so long as you can get the right vibe.