I've played around with some CSS and created a rough Cast of Characters type page in a simple two column layout.
This was created in Sigil, and displays correctly in ADE, Calibre, Sony reader software. Ironically, Sigil for some reason doesn't display it properly unless you resize the book view narrow enough.
I have no Idea how amazon would handle it, although what I came up didn't exactly require rocket science.
Screenshot of how it looks in ADE:
The epub file is attached to this post.