Why does it say that he's one of "Bruce Wayne's Gadgets"?[]
In the category section of this page, it says that Mister Freeze is one of "Bruce Wayne's Gadgets". Because Mr freeze's equipments can help Batman and they're useful to him.
Arkham Origins[]
Arkham Asylum[]
Arkham City[]
Will Mr. Freeze be in the Arkham Knight?[]
He's already in Arkham Knight.