Thomas is the secondary main character in "The Interpretation of Shadows". 

He's a burnt-out overachiever trying to relight his flame, Tom spends most of his time writing his undergraduate thesis. He’s one of Daph’s childhood friends, and now his roommate. As kids, the two found their friend’s body lifeless on the beach. The two were separated from each other after that incident and only reunited in college.

Tom rarely opens up about himself and his insecurities. Those brief moments of emotion are only ever seen by his roommate Daphnis. Still, for some odd reason, Daph's shadow-sensing powers do not work on Tom. Both are unsure why this limitation exists, but they consider it an unwitting advantage to their relationship (after all, some things are better left unsaid).