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9 is the titular main character of the Tim Burton 2009 film and the original 2005 short. He is the youngest of the group and represents the Scientist's humanity, good-heartedness, thoughtfulness, and sincerity. He is very intelligent, but he can make mistakes due to his curiosity. 9 forms a strong, almost brother-like bond with the Healer of the group, 5.
9 has a zipper on his body to fasten his skin which was open when he was created but was closed later in the film. Unlike the others, the Scientist didn't remark anything about 9 because of the Scientist's death.
9 even attempting to sacrifice his life, so 7 could retrieve the Talisman from the Machine and save the souls: along with 7 and the twins 3 and 4 , he is a survivor.