I'm not sure about the copy-pasting.
Howerver, you can use Japaneese characters in your name (in colour).
Go to LFS's Options > Driver > Driver Name
Click on the Driver name.
The default language might be Latin 1. Click on Latin 1 and select Japaneese.
Click on the small downward triangle symbol next to "Japaneese" and you will see the availalbe characters.
Before selecting the characters you can press down the CTRL button to select the colour of your choice (CTRL+1, CTRL+2... etc. keyboard shortcuts are avaiable for selecting the colours).