Describe a character who is fiercely competitive and will stop at nothing to win, no matter the cost

Describe a character who is fiercely competitive and will stop at nothing to win, no matter the cost. Some may see this character as ruthless and cutthroat, while others admire their determination and drive to succeed. Despite their intense need to come out on top, this character may also struggle with ethical dilemmas and have a complex internal struggle between their ambition and their moral compass. How does this drive for competition affect their relationships and decisions throughout the story?