Danzo does not have a Sharingan, Byakugan, or special weapon. However, he controls the ANBU Black Ops and has a wide range of informants. The anime suggests he was once very powerful but has injuries to his right arm and eye. He is seeking Kabuto or Anko, who would have acess to Orochimaru's powerful jutsu and medicines. Anko also opposes him, so she is a loose end.
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So the majority of Konoha wouldn't find out that Danzo had worked with Orochimaru
Anko does not marry and remains a bachlorette.
Mitarashi Anko does not have anything under her clothes.
behind Danzo's mask is what Danzo absorbed out of Uchiha Shisui.
No, only members of the Hyuuga clan have Byakugan, like Hinata and Neji. Anko has a curse mark from Orochimaru though