Hell butterfly sys-You cannot leave the soul society unless through using a hell butterfly given to you by a captain and possibly a lieutenant.

Soul-after death by hollow you are given a choice of wether you are devoured and become a hollow or your body itself is unusable and become a soul.

Soul burial-You can use this on an NPC soul or a player soul to send the soul to the soul society so they can avoid walking/flying or w.e. The shinigami itself gains experience or possibly reiatsu/reiatsu power and the soul gets a faster lift.

Body after death- Instead of just leaving blood when they are hurt a player leaves behind a body when they die, the victor of the battle could possibly search the body and gain some money or experience or w.e, possibly if a bounto is in soul society it can rejuvenate once due to the spiritual particles in the walls and buildings of soul society.

Quincy- Quincies could be able to get different bows from the usual after they have reached a certain strength[blood, dark, light, water, fire, air, normal]each of them would have special qualities, strengths, weaknesses w.e quincies could also have an absorb spirit particle verb, after using it the first shot is the strongest and the rest get weaker and weaker until you run out of particles.

thanks for the ides and interest in the game