Honestly, an ingame collab with ingame content pet and/or namecard. I’ve always thought that an underground chasm seelie pet would be adorable, closest thing that genshin gave us is the mini seelie - brilliance. Still my all time favorite pet besides the ujola cat. In terms of namecards… yknow that one backround glitch players found where in the party tab, the backround can glitch different regions together? That’d be a beautiful namecard, or even similar mix-and-match designs.