User blog comment:Brokenhearted15/Sonic Boom/@comment-4533965-20140905215611

Most Sonic characters are put with a stereotypical "I'm cool and I have an attitude" demeanor, so I'm sure we've always have Sonic characters like that (Knuckles is our earliest example of a Sonic character using this demeanor).

Really, the last "good" Sonic character added was Blaze. She at least has a personality that isn't dark or brooding or cool dude with an attitude.