Based on the "Project Splatoon 3" special weapon concept for the "Mako Cannon" by Alexis Pflaum.
Check it out here: https://www.artstation.com/artwork/XBzJAw
The inkling language font comes from the hard decoding work over here: https://splatoon-scripts.tumblr.com/
Software: Maya, Krita, Substance Painter, Marmoset Toolbag