Characterization of James in the Passage

In the following passage from a popular novel, we are introduced to a character named James. The author illustrates James's personality through his actions and thoughts:

"James stared out of the window, lost in thought. He often pondered life's biggest questions, finding solace in the quiet moments before dawn. His friends often described him as contemplative and reserved, preferring the company of books to that of parties."

Based on this description, how can James's character be best characterized?