Prime Personas (called custom Personas in the PSX version of Persona 2: Eternal Punishment) are Personas that serve as stronger versions of their original incarnations with upgraded skills. The prerequisite to obtain these Personas are mostly story involved. In the Japanese version of Persona 2 and Persona 3, prime Personas are indicated by the [//en.wikipedia.org/wiki/ Kanji] suffix kai (改, lit. "modified").