The Outerhaven writes: Did you know that Roo the Kangaroo from Streets of Rage 3 was added in the Streets of Rage 4 Mr. X Nightmare DLC? Well, he was and this is how you can unlock and play as him.

Source: N4G PC Unlocking Roo the Kangaroo in Streets of Rage 4 Mr. X Nightmare – The Outerhaven