| “ | Onee... tama! | ” |
–Male Diclonius when he meets Lucy | ||
Lucy's Half-Brother was a manga-only character. A Male Diclonii is almost unheard of and exceedingly rare in the narrative.
In the manga
Lucy's half-brother is the only true male Diclonius seen or spoken of in the Elfen Lied series. He was born through the rape of Lucy's long-lost mother by Chief Kakuzawa. He was a vital part of Kakuzawa's plan to kickstart the new Diclonius race, as Kakuzawa aimed to breed his son and Lucy and place himself as the "god" of the new race. Like the viable clones of Mariko, the boy had a mind-control device implanted inside his head, which kept him under control and inhibited his ability to speak.
Towards the end of the series, Lucy was taken back to Kakuzawa's Island HQ and held in a secret underground grotto, where she was told of his plans and introduced to her half-brother, who seemed to recognize their familial connection. Rejecting Chief Kakuzawa's megalomaniacal agenda, Lucy decapitated both him and her half-brother. She then apologized to his headless corpse by saying that neither of them had a right to exist, that their bloodline must end, and that she would also die very soon. This boy was also the half-brother of Professor and Anna Kakuzawa. Despite the Kakuzawa family's racial beliefs, this boy was the only member of their family who had ever been a true Diclonius.
Trying to appeal to Lucy in a cutesy, childish way
Whether it was due to the mind control implant or his genuine feelings, he seemed jubilant to see Lucy and eagerly tried to call out to her, albeit with a childish pronunciation. It's not known if Kakuzawa told him about his plans for him or if the boy could even understand them, considering he was a child, but regardless, he could have recognized Lucy as his sister using the same psychic ability Diclonii use to identify other members of their species.
Timeframe Issues
The time-frame of his conception and birth is unclear. He looks to be almost ten years old, but Lucy was only captured approximately four years before her one and only meeting with her half-brother, and if Chief Kakuzawa's claim is believable, Lucy's mother was only found out about after Lucy's capture. Even if the Chief (and by extension, Lynn Okamoto) had meant the mother's captivity occurred as soon as the staff had surmised Lucy's existence, this would only add a few to several months to his age. Even with an immediate identification and capture of Lucy's mother, almost another year would have passed before the Male Diclonius was born, making him at best three during the final confrontation. Since he was not a Silpelit, he, like Lucy, should have aged normally, and not at an accelerated rate. One possibility is that Chief Kakuzawa knew of Lucy and her mother long before Kurama and Professor Kakuzawa postulated their existence. Given the Chief's secretive nature and obsession with his family's supposed Diclonius heritage, quite possibly he was on the lookout for the birth of horned children outside his family. However, nothing in the series confirms or supports this. Another time-frame problem is that the Chief seemed set to have the pair mate soon, raising questions once again about the boy's age and whether or not he was near puberty.
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