Bismuth-215 (Element Cattos)
My isotope design for Bismuth-215 in Element Cattos (hasn't been added to the game yet, I just posted this), since Bismuth-215 didn't have an isotope design yet. (I already uploaded a picture of em to the wiki, both this design card and a pure image of kin)
"Bismuth-215 (215Bi) - e/em, ki/kin - bigender nonbinary - E are one of Bismuth-209's siblings (they're e're an isotope, duh!) E are very fashionable (I mean, just loot at em!) Ki likes mathematics quite a lot, kir bowtie is based off the Mandelbrot set. Ki likes being called cute and silly, e are also doing a little blep. :P Eir half-life is 7.66 minutes."
*I accidentally put "they're" instead of "e're". Ki does not use they/them pronouns in the slightest. Oops.