Without strength, one cannot carry out their duty. Without duty, there is no honor. Without honor, there is no purpose. Knuckles the Echidna stands as the last of his race after the traumatizing extinction of his people. With nothing left to do, the proud warrior guards his last emerald, and by extension, what is left of his home from any outsider who would dare threaten it. May blind fortune shine on whoever would be foolish enough to challenge him...

(Side note: like the other characters, the portrayal is up to the voice actor, and I'm open to whatever direction you go in. However, for this role, I would advise leaning more into the cool aspects of the character instead of the comedic side often associated with 2010 depictions.)