Final answer:
Without more context, it's impossible to determine which character flaw Jess recognizes in his own character. In Benjamin Franklin's thirteen virtues, mercy is not explicitly listed.
Step-by-step explanation:
The "flaw" that Jess recognizes in his own character and doesn't like is not explicitly stated in the provided context, so an accurate response cannot be given without additional information about the literary work or character in question.
However, if we reference the book Bridge to Terabithia by Katherine Paterson, where the protagonist is named Jess Aarons, we might infer that one of the character flaws Jess struggles with is fear -- fear of what others think of him, which can at times lead him to hide his true feelings and interests. Nevertheless, for a definitive answer to the question regarding this specific choice flaw, the context provided is insufficient.
Moving to the second part of the question, here is an answer regarding Benjamin Franklin's thirteen virtues. Among the virtues that Franklin aimed to cultivate were sincerity, temperance, and tranquility. Mercy was not explicitly listed as one of his thirteen virtues. Franklin's list aimed to cover aspects of personal behavior and ethical conduct rather than virtues related to interpersonal relations such as mercy.