User blog comment:Christlover357/How I Would Improve World Tour/@comment-5899967-20141011122952

1. TDWT was Heather's best season.

2. If Duncan wasn't in 1/3 of the main plots wouldn't have happened, we'd have empty episodes

3. If Trent, Eva, Beth, Justin were in, there would be no difference between the seasons, that's the reason Alejandro and Sierra were brought in, so that different seasons get different rosters, while keeping the main characters in.

For example, in the Smash Bros. series, you must always have Mario, Link, Pikachu, but some characters are one-offs, like Wolf, Squirtle, Snake, Roy, Lucas. Like TD, Smash does not have protagonists, however there are characters who are more important, iconic and recognisable.