1. A video game processing apparatus for displaying a player character operated by a player on a display screen and controlling progress of a video game, the video game including a battle against an enemy character, the video game processing apparatus comprising: a display including the display screen; a memory that stores a plurality of equipped items and a plurality of basic characters, the memory being one of a nonvolatile memory and a random access memory; a basic character determiner that determines a basic character from among the plurality of basic characters stored in the memory when the battle is started, the basic character being a basis for the enemy character; an additional data determiner that determines a level on the video game of the enemy character, a strength level of the enemy character, additional data on the basic character, and an equipped item from among the plurality of equipped items stored in the memory; and an enemy character generator that generates the enemy character by configuring the basic character in accordance with the additional data determined by the additional data determiner and by equipping the basic character with the equipped item determined by the additional data determiner, wherein the additional data determiner determines the level on the video game of the enemy character and the strength level of the enemy character according to a level on the video game of the player character, the additional data determiner includes: a basic level determiner that determines a basic equipped item level based on the level on the video game of the enemy character; and a custom level determiner that determines an adjusted level of the basic equipped item level based on a custom rank corresponding to the strength level of the enemy character, the additional data determiner determining the equipped item based on the adjusted level, the video game processing apparatus automatically determines, when the battle is started, the basic character, the level on the video game, the strength level, the additional data, and the equipped item, the enemy character generator generates the enemy character by the video game processing apparatus only storing data on the plurality of basic characters without separately storing data on the enemy character, and the display displays the enemy character generated by the enemy character generator on the display screen.