Answer: The traits I admire most in a person are honesty, courage, and compassion.
The last three elements of the sentence do not match in structure. "Honesty" and "courage" are nouns that name character traits and stand on their own. "Being compassionate," however, requires a gerund (-ing ending) to function as a noun. This last characteristic needs to be changed to "compassion" in order to achieve parallel structure in the sentence.