He is still aware that Tsukiyama wishes to eat him even if he tries to hide it, but Kaneki never shows concern for his own safety, trusting that his strength will intimidate Tsukiyama and keep him in check. He provides advice to Kaneki when the latter faces a crisis, and told Kaneki the truth about the One-Eyed Owl when Kaneki inquired him about it. This is evidenced by when Juuzou sees him and attempts to remember his name (failing to do so though, as he only remembers that the name starts with a "K") while dragging Yamori's body around.

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However, Sasaki was still prone to losing control, as shown when he fought the Serpent, where he also cracked his fingers during the fight—a habit that he had originally developed as Kaneki in the past.He knows that the world is a harsh and unforgiving place, but despite it all, people will still strive to be loved and chosen by those around them.

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It is a likely inspiration considering said horror constantly deals with flesh a lot (also both Fuminori and Kaneki are both main characters). Because he could not yet properly control his single kakugan that manifests in his left eye, he wore a medical eye patch to cover it.In his last confrontation with Kishou Arima, Sasaki's kakuja was capable of completely destroying IXA and Owl, while maintaining his personality and sanity. In the official English translation of :re Volume 1, Haise Sasaki's birthday is incorrectly given as April 22nd.