Thomas, also called Didymus, seems to be remembered for his doubting that Jesus arose. Some Biblical scholars point out all Thomas wanted was the truth.
He wasn't with the other disciples and the followers when Christ appeared to them. Hence his doubt of what he heard.
William Barclay reminds us of the courageous Thomas—he demonstrated love for Jesus when they heard of Lazarus' death. He displayed courage and loyalty when he told the others that they should go to Jerusalem “that we may die with Him.”