Scarecrow, aka Jonathan Crane, is a terrifying villain in the Batman: Arkham series, most notably in Batman: Arkham Knight, which cements him as the series' best villain over the Joker. The strength, resilience, and success that Scarecrow has over the course of the games make him the best villain in the series. The Joker is still the biggest villain from Batman: Arkham Origins through to Arkham Knight, but when it comes to actual villainry, Scarecrow has him beat in several ways, including effectively defeating Batman.
Scarecrow first appeared in Batman: Arkham Asylum as a secondary villain that served to slow Batman's progress as Joker got things ready for his big finale. Scarecrow challenged the Caped Crusader several times in Arkham Asylum by dosing him with fear gas and causing unsettling hallucinations. However, the Master of Fear was ultimately defeated and even appeared to have been eaten by Killer Croc. Crane didn't appear again until he was one of the main villains in Batman: Arkham Knight, but there were hints that he was still alive in Batman: Arkham City.
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Surviving being mauled by Killer Croc is an impressive feat in and of itself, but Scarecrow also controlled his anger and acted rationally by planning his revenge slowly. Professor Crane's calculated moves allowed him to predict what Batman would do, and each time he encountered him in Batman: Arkham Knight, he had a twist that allowed him to get away. Scarecrow even momentarily turned Jim Gordon against Batman by using Barbara Gordon as a bargaining chip. Although Scarecrow likely got most of his intel and strategies from the eponymous Arkham Knight, he was able to execute the plan perfectly and
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