AW8
Arcane
It is Scarecrow.So maybe he's the puppeteer. Ventriloquist (Arnold Wesker) and his puppet Scarface, were never show in-game. Only mentioned. Maybe this is the secret reveal? The "new" Scarecrow just looks... fake. Strings on skin, fake teeth.
His face looks like hell because of the mauling he took from Killer Croc in the first game.
Nearly mauled to death by Killer Croc in the sewers beneath Arkham Asylum, Dr. Jonathan Crane has returned to Gotham, surgically reconstructing his scarred visage into a new, terrifying face.