There's always 4 codes a patch, 3 from the livestream that expire in less than a day, and one that lasts the full patch length (iirc) Take part in the fragmented memories event Includes pokemon, yugioh, genshin, honkai star rail, digimon, project moon, touhou, various anime, etc) 684xcr2 (one of my extra codes being used as an archive containing an assortment of miis from different codes, mainly ones from the demo/first year era of miitopia's release
NUDE Vodka Cocktails | Drink it Chilled, Drink it Neat
Prolly will only last a few months since the trial on it expired)
If you have the official hoyolab app, you can directly claim from the genshin tab in it
