Kendall Roy of Succession. In spite of his privilege, he has desire for validation from his family makes his character complex and vulnerable. He aims high and desires power but is often undone by his own missteps and inner turmoil. This tragic element makes him both sympathetic and fascinating to watch. Despite his flaws, Kendall has moments of clarity and redemption where he tries to be morally righteous, especially when he seeks to expose his father's corrupt practices.
Kendall's complicated relationship with his father is the core of the series. He's also self destructive in terms of failure and identity and this makes him relatable in some ways, for me especially.