Henning had short hair that seemed to be pointing towards the back of his head and he wore the typical Survey Corps uniform.
Little is known about his personality, but due to the fact that he chose the Survey Corps instead of any of the other military branches, Henning was a man who wanted to fight the Titans to guarantee mankind's survival.
Before an investigation can begin, Titans appear within Wall Rose. Mike orders the group to split into four squads to warn the nearby villages. Henning is in Nanaba's squad, which begins searching Wall Rose for breaches. However, the squad encounters Gelgar's squad coming from the opposite direction without finding any, signifying that there is no breach. As night falls, the two groups take refuge in Utgard Castle.
Utgard Castle soon comes under attack from numerous Titans capable of moving during the night. During the ensuing fight, Henning and Lynne separate from Gelgar and Nanaba to check on the rookies within the castle while Nanaba and Gelgar eliminate more Titans and are both struck by a projectile thrown by the Beast Titan, killing them instantly.
Late in the Battle of Shiganshina, as Erwin Smith begins to lament the dwindling hopes of his dream, Henning stands among the many fallen Survey Corps comrades in Erwin's mind, wanting to know if their deaths had meaning.