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"Beyond Birthday (also known as Backup/B, BB) was the 2nd child taken in at Wammy's House, in an attempt to create a successor for L, and was the serial killer behind the Los Angeles BB Murder Case.

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 rumour. 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. Some people also speculate that similar to L and Mello's craving for sweets, Beyond Birthday craves strawberry jam. However, he was only said to have eaten an entire jar one time in Another Note: The Los Angeles BB Murder Cases and Naomi Misora never witnessed him doing so again, though she herself wondered about the same thing. It is possible that his love of sweets during the entire time with Naomi Misora was a charade as well. Although mentioned only once in the book, it is also implied that Beyond Birthday practices laughing quite often. Also, it is interesting to note that his laughter is referred to by Mello as a "Shinigami's laugh."  "
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