I don't see Tom as much of an ENTP. He's just so laid back. He doesn't DO anything. He rarely has strong opinions or takes strong moves of action. He's intelligent, but not inventive or anything. He seems like a relaxed ISTP to me. Very go-with-the-flow. He doesn't even have that ENTP drive for winning an argument, really. He's quick to just forget about it. He always concedes things to her, but offers reasonable alternate explanations, and he often wins, but this is only because everything Daria says to him is stupid.
That's the annoying thing about him. He makes Daria a total irrational bitch. For some reason.