Hi again!! My other suggestion would be a series interviewing the hosts
I'm sure all the learners here grow very accustomed (attached? haha) to the hosts when working through a chapter, the podcasts give just enough detail about their lives and expertise to give us an idea of their personalities, plus we see the dynamic between the hosts.
Often they have many interesting stories, and I'm sure a lot of those experiences could be aggregated into a biography or interview format. Learning from their experiences -- e.g. things they struggled with in learning the language, or immigrating to a Spanish-speaking country -- are definitely invaluable for us learners who are probably on the verge of experiencing the same things.
I did enjoy the written biographies, but it was missing Michelle and Alejandra from the Intermediate series.