User blog comment:KarpToEndAllKarps/What TD S6 Needs/@comment-30811918-20170918235555

The reason Duncan, Heather, Owen, Courtney, Lindsay last a long time is they are intergal to the show and those people also have huge fan bases of them. Also the characters mentioned above are actually key part in every season and are the most memorable due to them lasting a long time. There are also characters who do not get enough screentime due to them not needing any more episodes or just lack the potential.