I have prepared icons for "Aria Clip" and "Role".
This is how I envision these two icons:
They convince me, but if someone has a better idea, I'd love to hear it.
The icon for Aria Clip includes elements related to code (<>) and a human silhouette representing "Accessibility".
The icon for Role may be simplistic, but it is unique, hand-drawn, and refers to a similar solution – that is, the letter "M" for "Metadata Editor". I find it difficult to express "Role" in this sense graphically (and in the context of an EPUB file), hence the icon with the letter, which is a mnemonic (R for Role).