Hank is a former Glader. Thomas saw the name "Hank" written on the top right corner of a map of Section 8 of the Maze when Minho introduced Thomas to the Map Room.

the maze runner : his name was not on the wall. He survives the grievers attack and stays with gally in the glade

He is on the left of gally

Hank after grievers attack
Hank in box
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