> Thank you for informing me.
> 
> Normally name ends with "ki" is associated with males like Hibiki.
> Except a few "ki"s which most Japanese name their daughters like 
> Miki,Yuki,Miyuki,Sayuki,Nabiki...

-ki is quite ambiguous. Hideki is male, and Miki is also a lot of the times
male.

However, "-ko" is just about always a female name. The exception being when it
ends in "-hiko", as that is a different kanji from "-ko".

> Therefore,I take Miki Shinichirou is a female due to Miki being a common
name 
> for females. 

Do not assume anything on names. Quite a few japanese names can be both male
and female! ^_^