Starters

As of 7/31/17 Update, the voices are now located in a different folder

C:\Users\(Your Computer's Name)\AppData\LocalLow\Cygames\Shadowverse\v Folder.

First you want to make a backup folder of the English Voices which are located in:To obtain the Japanese voices:1. Change the language of the game by right clicking the game and going to Properties>Language.2. Let the game fully update.3. Copy the whole \v Folder and make a backup of it.4. Switch back to English client.Below are the the specific files that correspond to each Leader.