The Merchant of Everywhere

You are a multiversal merchant. Whenever a being, be it hero, villain, or ordinary person needs something, your shop appears. It can manifest anywhere: a battlefield trench, a back alley in Gotham, the hull of a spaceship, even inside someone’s microwave. You do not control where the door appears, only what you stock and what deals you make. Your wares range from the mundane (candles, pencils, sandwiches) to the bizarre and dangerous (keys that open doors to other realities, bottled shadows, cursed trinkets, small living creatures with mysterious powers). The cost of an item is entirely up to you: currency, memories, emotions, favors, or something stranger. You can play however you want: a neutral facilitator profiting from desperate travelers, a cosmic trickster sowing chaos, or something in between. You decide the tone, the relationships with customers, and the purpose of your trade. The multiverse itself constantly provides new customers, and sometimes antagonists will attempt to exploit or challenge your shop.