The Batman Who Laughs is a relatively new addition to the DC Comics universe, having made his first appearance in the 2017 mini-series Dark Nights: Metal. The character quickly gained a significant following due to his unique design and disturbing backstory, and has since become a fan favorite. One of the reasons why the Batman Who Laughs is so strong is due to his unique combination of abilities and characteristics.

Firstly, the Batman Who Laughs is essentially a hybrid of two of DC’s most popular characters: Batman and the Joker. This combination results in a character who possesses the tactical skills and resources of Batman, combined with the unpredictability and chaos of the Joker. This unique combination makes the Batman Who Laughs an incredibly dangerous adversary, as he is able to outthink his opponents while also keeping them off-balance with his unpredictable behavior.
Additionally, the Batman Who Laughs possesses several physical and mental enhancements that make him extremely strong. For example, he has increased strength, speed, and agility, as well as heightened senses and an enhanced healing factor. These physical enhancements make him a formidable opponent in hand-to-hand combat, as he is able to match or exceed the physical abilities of most other characters in the DC universe.
Mentally, the Batman Who Laughs is also incredibly strong due to his unique blend of intelligence, insanity, and cruelty. He is able to think strategically and plan out his actions with great precision, while also being able to anticipate and counter the moves of his opponents. At the same time, he is completely devoid of any sense of morality or compassion, and is willing to go to extreme lengths to achieve his goals. This combination of intelligence and cruelty makes him an incredibly formidable opponent, as he is able to outthink and outmaneuver his opponents while also being willing to take extreme measures to achieve his objectives.
Another reason why the Batman Who Laughs is so strong is due to his ability to manipulate and control others. He is able to infect other individuals with a special toxin that turns them into twisted versions of themselves, loyal only to him. This ability allows him to create an army of followers who are completely devoted to him, and who will do his bidding without question. Additionally, he is able to manipulate the minds of others using his telepathic abilities, making it difficult for his opponents to discern what is real and what is not.
Finally, the Batman Who Laughs is also incredibly strong due to his ability to harness the power of the Dark Multiverse. This is a parallel universe that is home to twisted versions of DC’s most iconic characters, and it is a realm of pure chaos and destruction. The Batman Who Laughs is able to draw power from this realm, which gives him access to a wide range of abilities and powers that are not available to other characters in the DC universe. This includes the ability to create and manipulate dark energy, as well as the ability to control and manipulate reality itself.
In conclusion, the Batman Who Laughs is an incredibly strong character due to his unique combination of abilities and characteristics. He possesses the tactical skills and resources of Batman, combined with the unpredictability and chaos of the Joker. He also has physical and mental enhancements that make him an extremely formidable opponent, as well as the ability to manipulate and control others. Finally, he is able to harness the power of the Dark Multiverse, which gives him access to a wide range of abilities and powers that are not available to other characters in the DC universe. All of these factors make the Batman Who Laughs one of the strongest characters in the DC universe, and a force to be reckoned with.