Knuckles is independent, headstrong, devoted to his duty and slightly gullible. He is very serious and usually likes to be by himself, but can be relied upon to help out whenever the world is in danger. Because of his flaws, he and Sonic do not always get along, but are still allies. However, he is also capable of being friendly towards others, although he still retains his aggressive behavior. He even shows some friendly sarcasm occasionally. 