Mii

Mi was a Human child that was saved by Zero Kiryu.

History
Mii's grandmother used to call her 'Mii-chan'.

Plot
Mii was shopping with her grandmother when she was kidnapped by a vampire. She was hiding and sobbing, when Zero came to recuse her. She was scared of him, but he then tried to comfort. Zero carried to her grandmother, and before they were able to thank him, he left without a trace.

Many years decades later, when Mii was out with her grandchild and husband, she recognised Zero. She asked him if he was related to the man that saved her many years ago, to which zero replied that he didn't. As she walked away, Zero was shocked to see that she had remembered him after so many years. Yuki commented that is was good that Mii got to live a happy life thanks to Zero saving her.