Beyond Birthday was the second child taken in at Wammy's House, in an attempt to create a successor for L; however, the pressure was too much for him and he ran away from the orphanage.
In reality, he is the serial killer behind the Los Angeles Serial Killings. Beyond Birthday has never appeared in the manga, anime, or film series to date, but the BB Case was briefly alluded to in both manga and anime. He was born with Shinigami Eyes, which allowed him to see and know when exactly people around him would die, as well as knowing their full names. He uses this ability to pick his victims and kill them when they would have been destined to die. It is unknown how he could have possibly been born with the eyes, though Mello wonders if a Shinigami dropped its eyeballs to Earth (instead of a Death Note). Some have claimed that Beyond Birthday is a cannibal, but this is only a rumor. The novel did not say anything about him eating his victims' remains. Though this could be true, further information has yet to be revealed. During the investigation of the Los Angeles BB Murder Cases with Naomi Misora, B is described to have a jar filled with strawberry jam, in the victim's fridge. Similar to L and Mello (and their addiction for sweets), Beyond Birthday craves strawberry jam. He tends to practice his laughter quite often as well.
Little is known about B, though him and A (real name unknown) were the first two children in line to succeed L.
His whereabouts remained unknown from May 2002 to the beginning of the story, L having tracked cases around the world to search for him. Beyond Birthday came up with a plan to surpass L, as the "World's Greatest Criminal," giving L a case that B made sure he couldn't ever solve.
Beyond Birthday's first known victim was the freelance writer Believe Bridesmaid, whom he killed July 31st, 2002, after drugging him and then choking him with a rope. Four Wara Ningyo (straw dolls) were left at the crime scene, and in post-mortem mutilation, Bridesmaid's chest was slashed several times; the killer also took the time to re-dress him. When looking at the autopsy photos, Naomi Misora found that the wounds were made to resemble letters (in actuality, a Roman numeral code spelling out the name of the next victim).
The second murder happened four days later, on August 4th. The victim, Quarter Queen (a 13-year-old girl), was also drugged before her death, the cause of which was blunt force trauma to her skull. Her eyes were also crushed in further post-mortem mutilation. Three Wara Ningyo were left at the scene of the crime.
The third killing happened nine days after Quarter Queen's murder. Backyard Bottomslash was a 28-year-old bank worker who had also been drugged before her death, though her age fell in-between those of the previous two victims (44 and 13).  {C This happened when Beyond Birthday wanted to find out if a human can die of an internal hemorrhage without rupturing any organs. Beyond Birthday conducted this experiment by drugging and then beating Backyard Bottomslash's left arm without breaking the skin. When this did not work, her death was caused by loss of blood, with her right leg and left arm cut off. The right leg was discovered in the bathtub later. The left arm was taken by Beyond Birthday. Two Wara Ningyo were found nailed to the walls in a similar manner to the other two cases.
Some years later, in jail, he dies from a heart attack caused by Kira.
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