A player card is what you put on your userpage that keeps track of your character's progress and power.
All characters start with Spiritual Energy of 5000. When you level up your Spirit Energy is timesed by 4.
When you train you gain one EXP Point a minute. If you train with someone else you gain 1 EXP Point a minute plus one EXP Point for each time you hit the enemy.
When you level up you gain 2 damage and 2 speed.