Knuckles (Sonic Adventure 2)

"Hand over those Master Emeralds! Give them to me!"

- Knuckles

Knuckles the Echidna is fought as a boss in the Dark story of Sonic Adventure 2. He is fought by Rouge the Bat, after clearing Mad Space.

Personality
Knuckles is tough, determined and brave. He is calm and collected in almost all situations that don't involve the Master Emerald being stolen. Knuckles has a strong hate for thieves, which creates a tension between him and Rouge when it comes to her stealing his emerald. Despite that, Knuckles selflessly saved her life, though she tried to snatch the Master Emerald While fighting him.

Despite his toughness, Knuckles also shows kindness towards innocents and people who are nice in return, and is quite passionate to everyone, even villains like Rouge and Dr. Eggman.

Battle
The battle takes place in the large tower seen in the center of Knuckles' stage, Meteor Herd. Knuckles will attack either through his Punch Attack, or by gliding and using the Drill Claw. Rouge must attack him when he lets his guard down. Eventually, the floor below the two will open, sending them into the air. The fight will continue on the sides of the tower when this happens, until the floor closes again. As Knuckles takes damage, he will begin to use two special moves depending on Rouge's distance from Knuckles. If she is a short distance away, then Knuckles will use his special move, the Hammer Punch, to stun Rouge. If Rouge is a very far distance away, then Knuckles will use the Thunder Arrow. Four hits are required to defeat Knuckles.

Trivia

 * The fight against Knuckles in the Dark story is identical to the fight against Rouge in the Hero story.
 * Along with Rouge, Knuckles is the only character boss not to be fought twice in the story.