Remix if you can find more of them. By the way, I'm starting to think I should change Nalu's theme from astronomy to chemistry (I'm obsessed with the latter and physics these days). (Also, when I put in the Magnesium card, it would always assume it was some social media account called Lil Broc. Same with Mr. Sun from Sprunki and the Hydrogen card.)
The largest slice of credit pie goes to whoever made these characters (which I may borrow inspiration for an upcoming set of characters). I found Hydrogen, Helium, Carbon and Oxygen in this slideshow project by a user called @scorpion_bite. https://scratch.mit.edu/projects/1092545215/ Nitrogen was found by @jcman1122. The others came from a website called OutSchool.
