Batman & Robin: The sequel to Batman Returns, it has Micheal Keaton return for the role of Batman as the tone of the movie was made a bit lighter to deal with parental complaints yet at the same time, did not shy away from serious subject matter. The latter was reflected with the introduction of Robin, an acrobat turned orphan adopted by Mr Wayne and who is trained to become Robin, providing an interesting perspective on crime-fighting while also highlighting the serious tone Batman can have. Batman and Robin team up to fight Scarecrow (who used the fear gas to kill Robin's parents), as a professor turned hitman along with his accomplice Poison Ivy, a former university student who gained strange plant-like cabailities from an experiment by a colleague of Scarecrow. Barbara Gordon also appears, as a student and witness who flirts a bit with Robin.
Batman Forever: The sequel to Batman & Robin, and the final movie of the Keaton quadrology, it has Batman beginning to feel his age after years of Batman. By this point, Robin has graduated to becoming Nightwing while also dating Batgirl, who's introduction was teased in the prior film and her costume shown in the stinger. Batman recalls many past villains put away and he wonders what will be his legacy as he feels he doesn't know if he has made process. However, he soon ends up lighting up when he meets Andrea Beaumont, an old friend from his past who he re-lights a relationship with to their past tragedies. Meanwhile, a mysterious doppelganger has begun targeting many of the authority figures of Gotham in a Batman-like manner. Batman and Robin end up discovering it to be Wrath and Scorn, a pair of villainous doppelgangers who lost their criminal parents to cops and wish to upset the order. The fight is equal up until Batgirl gets into the picture. The evil duo swear they will have vengeance. It is later discovered their backstory while wodnering made this way. Meanwhile, Bruce's stress forced him to see a psychologist, Hugo Strange (played by Robin Williams) who figures out he is Batman. It turns out Strange used hypnotherapy and brainwashing to have the to criminals become an anti-Batman and Robin and to prove his superioirty, does the same to Andrea to turn her into the Phantasm. During the fight, Batgirl switches with Batman and finishes off Scorn while Robin defeats Wrath and restores confidence in himself after wondering if he could become Batman when Bruce retires. Bruce is able to snap Andrea back and they're able to use the tactics on Strange, robbing his memory of Batman's identity while he confesses to everything. Bruce decides he must retire as Batman and to enjoy his life with Andrea, entrusting the future to his enw proteges. While Bruce may live his life on, Batman will live forever, best seen in the epilogue when Dick appears in a new Batman costume alongside Barbara (as Batwoman) and the new Robin (heavily implied to be Tim Drake) and a new Batgirl (implied to be Stephanie Brown.)