Mai Senju

Mai Senju is the granddaughter of Hashirama Senju, wife of Wan Keisatsu, mother Poji Keisatsu and grandmother of Karuto Keisatsu. She was the heir to the Senju Clan which allowed her to have Hashirama's abilities just like her parents. Mai lived in hidden village of the leaf for 12 or so years before the massacre of the Uchiha but she manage to escape with Wan to Amegakure and hid themselves from Danzo and the rest of the elders. Mai did not change her last name as she respected her clan and didn't feel it was necessary. Mai later confronted Danzo about the murder and tried to kill him but failed and told him that if he were to come near her family she'll give to everyone enemy nation that Konoha is growing weak and is in attackable state. She also went to third hokage and asked him if Danzo came after her, he'll have executed the Third agreed to it and she also ask the same of Sasuke Uchiha. Later on tragic night after rescuing Poji from the Bureka faction, Poji killed her and Wan accidentally when he was in the Bureka state.

Mutation
Mai was many of the victims of the this Kekkei Genkai. And since she had only two Kekkei Genkai there was no need to block all her Kekkei Genkai which made her an efficient opponent. She was later defeated and freed by her son. Poji manage to use his sword to absorb her Magnet Release and Wood Release. She told her son not to punish himself for her and his father's death and to move on.