John gave his readers the Aramaic and Greek names of this member of the Twelve, now the Eleven: "Thomas" and "Didymus" respectively (cf. John 11:16; John 14:5). John"s previous pictures of this disciple present him as a loyal and courageous, though somewhat pessimistic, follower of Jesus. His more common identification as a doubter comes only from the present event. [source][source][source]
Thomas had no doubts that Jesus had died. This is another evidence that Jesus really did die. However, he refused to believe the other disciples" report that Jesus was alive without personal physical proof. He insisted on touching Jesus, and specifically His crucifixion wounds, not just seeing Him. No one else in the New Testament made demands like these before believing. [1] The Greek text clarifies that the other disciples kept saying (Gr. elegon, imperfect tense) that Jesus was alive. In spite of this repeated verbal testimony by those who knew Him best, Thomas refused to believe (cf. John 4:48). He had become so thoroughly convinced that Jesus was dead, as evidenced by his references to Jesus" wounds, that he could not see how Jesus" crucifixion could be overcome. [source][source][source]