As I successful done the custom address generation with XGOX, XGOD and Joy, I will try the same with new Mirai. For custom address generation I use vanitygen. This program generate the private key that have to be imported in wallet.
But first I need some cool Mirai address, something like:
MyMiraiXfhjjkfssv38fjkdgjjkv
MasterNodeXfhjjkfssv38fjkjkv

When successful done it, I will report here.