Each player has two characteristics.

Unique Ability
Each player has a Unique Ability by default.
It can be improved by reaching achievements during game play by using the player.
Players also receive a title when they reach a higher status based on the growth rate of their Unique Skills.

Player Skills
All players have two skill slots.
Batters have skill slots for offensive skills and defensive runner skills.
Pitchers have skill slots for pitching skills and ball control skills.
Each slot is unlocked depending on the player's Level-Up count.
The skill from the list is equipped to the skill slot when you attempt to equip a skill.
The number of skill types expands when players have upgraded.
High grade Player Skills can be equipped when promoted.