! THE CHARACTER YOU MAKE MUST BE A VECTOR ! btw for appearance your character will be the best size if it mostly fits inside the thin-outlined box also yes you can add esoteric programming languages
and if ur wondering what characters already exist, go to https://scratch.mit.edu/projects/1049296625/ current recommended characters: CSS, Bart JPEG, Python +, code.org, makecode, B.A.S.I.C, blender