Add these apps:

[fallsdevil]

• simple markdown
• FUTO keyboard (I don't know if it's exactly material you, but it looks a lot like gboard)

[anebix-world]

Just for reference (if someone gets to it before I'm able to later this evening)
Simple Markdown is MD
Futo is MDY

Though Simple Markdown isn't entirely MD, it's really just the toggle switches it seems? Aside from the red color it's not very material, I think

[fallsdevil]

Thanks for that, about simple markdown I believe it is complete in material you because the navigation interface and context menu are the same as other apps with this, although it apparently only has one color and I don't think it is dynamic