Jackie is Super Rare Brawler added on the March 2020 update.
Jackie is a very loud Brawler that has a jackhammer. Her tool is so loud that causes damage to nearby enemy brawlers.
Her attack is quite unique. You don't have to aim at all. She causes damage to all brawlers inside a short surrounding area. Her damage is quite strong, bu you must be close to the enemy to be able to cause any damage.
On her Super she pulls all nearby Brawlers and causes damage to them.