My universe has an inventory system, based off of fame and infamy, or to shorten that concept, Karma.

After someone has preformed enough deeds, good or bad they achieve a hero level, which gives them a glowing symbol the deity of karma and time on their wrist, or if lacking wrists, it can go on other points of the body, it can be moved to the adventurers liking.

It can be accessed at will to show inventory, which can be personalized with custom categories. An adventurer can open up the middle bit and put items inside, and take them out.the amount they can carry is determined by karma level.
This sigil on the wrist can also be used to view ones own condition, and stats.

Also, the colors of the sigil interface is determined by the make of the soul, which is a whole other system, which can be found here: https://www.furaffinity.net/view/55179284/