Amir in The Kite Runner and Tariq in A Thousand Splendid Suns are the two characters that are most similar to Luddie Mueller in The Thorn Birds.

McCullough describes Ludwig "Luddie" Mueller as a kind and compassionate man. He is respectful, caring, and supportive, and he has a stable and loving marriage with his wife, Anne. Both Luddie and Anne are very good friends of Meggie and Justine.

In The Kite Runner, Amir shares the most similarities with Luddie personality-wise. As a child, Amir is presented as an entitled, selfish, insecure, and spoiled boy who wants nothing more than to make his Baba happy and earn his love and affection. As an adult, however, Amir is the complete opposite—he grows up into a sensitive, emphatic, and selfless man and shares many similarities with Luddie's character. Just like Luddie, Amir loves and respects his wife and is always there for her when she needs him.

Tariq in A Thousand Splendid Suns is presented as a loyal, gentle, and respectful man. He doesn't allow his hardships to define his life, and he's always kind, patient, and compassionate. He adores his wife and family and is simply a good man at heart. His personality is quite similar to Luddie's, with the most notable difference being his easygoing and mischievous nature.