Board Thread:Character Discussion/@comment-3095286-20170121174428/@comment-27086946-20170122181829

No, not every character is important, especially if they happen to be minor characters like the Goth Kids. They are minor characters who pastiche the stereotypes of the Goth culture, but otherwise don't really play an important role in episodes that don't focus on them.

In terms of important characters to the series as of late, those would be characters like Kyle, Cartman, Randy, Butters, PC Principal, Heidi, Lenart Bedrager, basically any character that has impacted the story of the last two seasons, which the Goth Kids have not done (though that said, Stan and Kenny have barely impacted Seasons 19 and 20, despite their supposed "main character" status).