
Emily F. answered 05/16/19
Effective English Tutor with M.A.
In reference to Shakespeare, his main plots generally centered around the upper-class, while subplots focused on the lower class. In addition, this particular subplot mirrors the main plot, adding a parallel, something else that was fairly common during that time period. And yes, a good chunk of the reasoning behind Malvolio's character is to provide some comedic relief at times that may not be offered by the main plot.