Responses
Your method is similar to mine. Cheat sheet is the way to go:
Haruki rhymes with aniki = big brother
Haruka rhymes with oka(san) = mother
Hikaru rhymes with fuck you = shit brother
Awesome cheat sheet man. Now I will never forget the names.
Kudos on the liitle bro by the way!!ヾ(☆▽☆)

Haruki, Haruka and Hikaru. The names make me so confused!