Ahh!! A podcast about AYU!! How fun!
It would be really cool if you could find some really rare facts. Like if you could get someone to translate old magazine articles (I know we have a couple here, but even more!) and really dig deep. I'd mention the relationship with her mother/father/grandma, because that's always touched me, and even briefly mention her relationship to Tomoya (because the fact that she was with another celebrity for 7 years has always been amazing to me, and really shows a lot about her loyalty and capacity to love another). I'm not trying to get it to sound to tabloid/gossipy, but I just think a few of these things would be interesting to both current Ayu fans and those just learning about her.
The other parts will be easy: Just talk about amazing she is! I know I could go on for hours. :p lol.