Knuckles in Episode 3 would be brilliant. I liked him better when he was a silent antagonist/anti-hero anyway. Now he's a a stupid but well meaning good guy who occasionally makes half-assed one-liners to make it look like he's still rivals with Sonic. Of course, there are other story options to explain him being a rival towards Sonic besides "OH NOEZ EGMEN TRICKED HIM AGAIN. OH KOOCKLES, U SO GULABLE, U SILLY BOI."