User blog comment:Fan7/Duncan, Owen, and Courtney - The Most Popular Characters?/@comment-1756703-20100719175815

Regarding other sites, I've noticed that on Youtube and Deviantart, the Total Drama characters featured the most are easily Gwen, Courtney, and Duncan. Izzy and Bridgette are also quite popular on Deviantart. And on Fanfiction.net, the underdogs (such as Noah, Ezekiel, Cody) are quite popular as well.

Different sites have different perspectives, obviously, but in general, I'd say that the love triangle trio rule in terms of popularity.