Jack is an enemy in Streets of Rage 2. This miniboss is a thug who wields a pack of infinite knives. He has the ability to pull out infinite knives from his coat. Shortrange attacks have him able to jab and punch players. Midrange, he will attempt to stab the player. In longer ranges beware, he will throw knives at players. He laughs at players when he feels they are no threat to himself or when he feels the threat is defeated. A retro fight against him can be unlocked in Streets of Rage 4.
- Jack and each of his palette-swaps have a bean-themed name. Jack himself (as in Jack and the Beanstalk), plus Soya (soybean) and Beano.
- Beano was named after a brand of sweets.
- While a concept art of Jack was created for Streets of Rage 4, this appearance did not make it to the final game, though a battle against his Streets of Rage 2 incarnation is possible in Survival Mode.