To expand your roster, you must earn by completing battles. These points are used in the in-game shop to purchase additional battle and support characters.
If you're looking to expand your roster, this video explains how to earn J-Points and unlock every character: J-Stars Victory Vs. + | How To Unlock All Characters YouTube• Jul 1, 2015 Regional Versions Download J-Stars Victory Vs Plus (Europe, Asia)...
The PlayStation versions are generally region-free, meaning a Japanese or European disc will work on a US console. To expand your roster, you must earn by completing battles