Final answer:
Harry's career ambition in the Harry Potter series is to become an Auror.
Step-by-step explanation:
The subject of this question is English and it is appropriate for High School grade students.
In the Harry Potter series, when Harry meets with McGonagall, he states that his career ambition is to become an Auror. This means that he wants to work as a Dark wizard catcher and protector of the wizarding world. This choice is important as it shows Harry's determination to fight against dark forces and his desire to make a positive impact.