Knuckles the Echidna is a Clever, focused and loyal person. Being secluded from others for so long he grew up believing in honesty, though this can lead to him being naïve at times and also gullible. He's also got quite a temper, usually channeling it in battle, but sometimes getting angry at others when they bother him too much (Tails talking about tech comes to mind at times). He also treasures his island and the Master Emerald and is usually seen guarding it. 

How Knuckles should sound: Knuckles should like his Adventure era/4kids interpretation, both have their strong suits, but preferably Knuckles should sound Confident in himself, He can get frustrated when others bother him and usually get angry if provoked, Knuckles should also sound Stoic and reserved when he's not the main focus but should still keep that confidence. He also will occasionally banter with Sonic and co, usually offering up a challenge of sorts.

This will be a lead role For Sonic onset Adventure.