Elfen Lied/WMG

The Woman who took Wanta from Mayu was not his real owner.

• She was a scam artist who preyed on the homeless, glomming onto whatever valuable or saleable items they might have. Notice how she waited until she and Mayu were alone on the beach, rather than the boardwalk, to confront her, and the fact that Wanta ditched her quickly, with her never seen again once Mayu had a home and protectors who would stop her from just grabbing the dog.

The marriage of Mayu's mother and stepfather dissolved after she left.

• Targeting Mayu might have been the sole reason he married the mother in the first place. With her gone, the mother was justly left alone.

Chief Kakuzawa knew about Lucy before her capture.

• The apparent age of Lucy's half-brother by way of Kakuzawa's rape of their mother does not seem to match up with a boy who could not, by way of series' events, be more than three or four.

The virus is from outer space and there has been an outbreak before.

Lucy and Sil both gain superhuman powers from a virus, are treated horribly by humanity and so want to Destroy All Humans!, and they are both feared for their ability to breed. Also for some reason a side-effect of the virus is Fan Service.

The Diclonius have a distant alien origin as does the Kakuzawas' lesser mutation.

• A British professor of note, Bernard Quatermass, once spoke of horned insectoid Martians who influenced Human evolution in the distant past. They were known for their telekinesis, self-destructive aggression, and the ability to sense who was and was not of their kind, even in Humans who felt their genetic presence. The brief and savage awakening of their influence in modern Humans caused the eventual birth of Lucy's mother, the true originator of the virus. Another crashed Martian probe like the one found in a proposed London underground station existed in an island off the coast of Kamakura and caused an otherwise wholly Human family to develop vestigial horns on their heads, mutations which only worsened when the persecuted people of the Horn Valley--or Kakuzawa--fled to this very site.

Lucy's half-brother would have joined her in revenge if she hadn't killed him. Massive spoilers below

• Think about it. The boy had a device on his forehead just like Barbara and the other Mariko clones that controlled his behavior. While he looked all nice and docile, if Lucy had removed the device, he would have lopped Kakuzawa's head off right then and there. And with Lucy being his only family left (family he is apparently fond of immediately given how he reacts to seeing her), he would have no other connections in the world and would have clung to her. Lucy may not have liked it (he was the product of her mother's rape after all, though that isn't the kid's fault), but family is family, right? Given her surprise to hear the woman was looking for her and how lonely Lucy's life has been, it isn't that strange to think she would welcome the company of a little brother. And after their escape from the facility...well, that's all I've got.
  • All I could say to that is, while a valid notion, to my mind the boy is still a Kakuzawa, likely exposed to their delusional eugenics and messianic theories, and prone to seek power, which he already has. Lucy, when she met her brother, was exhausted and just as tired of others using her kind as she was the hatred. Their line had to end.
    • He may be a Kakuzawa, but the megalomaniac tendencies of the boy's father and brother aren't genetic. He was also very, very young (he can barely even speak properly) and mostly likely wouldn't have understood anything his father told him besides "You are special to our race," "You're our future," etc. That's the point of the "what if," that if she hadn't been so tired of everything Kakuzawa and his ilk did to their kind, the boy would very likely have joined her.
    • Again, a fair point. One outcome is as likely as another. Perhaps the reborn Anna could have been a good influence on him.

== The two girls that greet Kouta == at Kaede's Dog's grave... ...are Diclonii. Because it would fit with the metaphorical reincarnation of Kaede and Nyuu and they have hair... holding-things in the right place.

Aiko Takada actually didn't die.

For most of the manga, Lucy and the viewer are led to believe Aiko Takada died taking a bullet for her. However, during the last chapter of the manga, Wanta walks past a poster for an art exhibit, and the woman on the poster looks like an adult version of Aiko. What's more, the name "Takada Aiko" is written on the poster. This led me to believe two things:

• Kurama lied to Lucy about Aiko's death in order to keep her from looking for her. It's a lot easier to keep a dangerous test subject contained if they have no reason to try to escape and reunite with someone.
  • Since Aiko's "Death" caused Lucy to swear Revenge by Proxy on Kurama, I guess that didn't really do much for him.
• Since Aiko accidentally killed her father, Kakuzawa probably offered to cover that incident up as long as she stayed quiet and forgot all about what happened in the warehouse.