[Original + Iron] The Stellar Core's Gacha System

After resolving the crisis on Penacony, one Stellaron gremlin barely had time to go wild on the festival planet before he and his bat were sent flying to Teyvat. Confronted with an unfamiliar world where technology had yet to connect to the cosmos, the Stellaron gremlin stood there dumbfounded. Fortunately, he discovered that he had been bound to a strange gacha System. Anyone he had ever met before could be drawn, granting him their appearance and abilities. The Stellaron gremlin: "Secret identities? Yeah, I get it." To get back aboard the Astral Express, the Stellaron gremlin began adventuring (and going off the rails) in Teyvat. This included, but wasn't limited to: [Using Aventurine's face to gamble to his heart's content at the Heyu Teahouse, then trying to keep the neighboring consultant who was having tea with him;] [Using Argenti's face to play cards with the Eremites, only to get hunted down by the Great Mahamatra for assembling a crowd to XX;] [Using Dan Heng's Imbibitor Lunae form to make water for the Iudex, only to accidentally mix in some alcohol;] When the Stellaron gremlin finally made it back to the Express, he discovered that time had rewound to the moment he first woke up, when Dan Heng was trying to give him CPR. To his delight, the Stellaron gremlin found that the gacha System had come along too, and he could now draw secret identities of people from Teyvat. So: [Using the Warden's face to evade capture, handcuffing Sampo for trafficking antiques, and tossing him to a certain guard captain to pay off his debt with his body;] [Using Zhongli's face to tell stories at the Xianzhou docks, where the love-hate saga between the former High Elder and a certain Stellaron Hunter became all the rage in the Luofu;] [Using Alhaitham's face to hack Penacony's dream-entry system, then working with the Dreammaster to set up all kinds of rooms in the dreamscape that you couldn't leave unless you XX;] The Stellaron gremlin: "As long as I use someone else's secret identity, nobody will know what I did." Everyone whose memories were preserved in their secret identities, and who could even share memories with them: Oh? Is that so? The Stellaron gremlin froze. "Aren't the people in the gacha System just secret identities? How can a secret identity retain the original person's memories?! Partner, help me out here, partner!" The Traveler, who had been called out: Read. A few things to know before reading: 1. A joy-loving Stellaron gremlin x a goofy Traveler 2. Lots of side couples, the author ships all sorts 3. Characters from both sides will visit each other's worlds later on P.S. Side-couple warning: Genshin side couples: Diluc/Kaeya, Zhongli/Childe, Ayato/Thoma, Alhaitham/Kaveh, Wriothesley/Neuvillette Star Rail side couples: Sampo/Geppard, Blade/Dan Heng, Dr. Ratio/Aventurine, Argenti/Boothill, Feixiao/Jiaoqiu (Characters not mentioned have no obvious romantic pairing; they just get put through the wringer.) Theme: The world needs joy and beauty.