The son of Hall of Famer, Rick Barry, Brent Barry was one of the most accurate shooters during his time in Seattle.  Known for his three pointer, Barry would never shoot below .400 from behind the arc, including one season (2000-01) where he led the NBA.  Barry would also lead the Association twice in Effective Field Goal Percentage and once in True Shooting Percentage. 

A defensive minded Guard, Nate McMillan played all twelve of his seasons in the National Basketball Association with the SuperSonics.  Five seasons, McMillan would average over 2 Steals per Game, including a 3.0 run in 1993/94 that would lead the league.  Twice he would make Second Team Defensive honors.  While McMillan was not known for his offense, he was a decent distributor and had solid Assists numbers throughout his career.

Inducted into the Naismith Basketball Hall of Fame as both a player and a coach, Lenny Wilkens was a player for Seattle for four seasons going to the All Star Game in three of them. 

Spencer Haywood challenged the rules of the National Basketball Association by declaring himself eligible for the draft after his sophomore season in college.  The NBA refused to allow him to play (as the rule at the time was that a player was not NBA eligible until the college class graduated) so he went to the upstart American Basketball Association and promptly won the league MVP as a rookie.  As you can imagine, somebody from the NBA would covet a talent like this, which was occurred when Seattle signed him anyway and a lawsuit went all the way to Supreme Court.  The NBA settled and the Sonics had a star.