Greetings!
I think you're off to a reasonably good start with your thesis statement, but I do have some suggestions.
"Chaucer is very descriptive when he explains the pardoner's character. - Words like "very" do the opposite of what they intend to do: they weaken your writing, rather than strengthen it. You could, instead, say something like "Chaucer's detailed description provides insight into the pardoner's character."
Chaucer describes the pardoner as a person who abuses his position as a member of
the clergy by
manipulating common man, whose work ethics revolve around his greedy motives,
and whose gross appearance highly reflects on his characters." - the last phrase, which I highlighted in bold, does not really make sense as written. I think you meant to say "whose grotesque appearance is reflective of his bad character."
I hope this helps!
Thanks,
Sarah, EssayForum.com
Sarah, EssayForum.com