Okay, so I played some more in Japanese, and peppies do talk about music and fashion, but they seem a little more self-aware and less "living a fantasy" than in English. In one conversation, Flora said she's like to be on a music show on TV and sing a ballad and play the guitar. But then she did the embarrassed reaction and said that actually, she was just now recently learning the guitar. In another convo, she mentioned that lately she had become interested in fashion. Then something about her interest making her seem shallow/not deep (I think - I had some trouble translating that sentence), but that the number one thing was to wear what you like.
So I think they have the same basic conversation topics in French and Japanese (and English), but the delivery and nuance is a little different.
I tried to get Tangy to talk about acting/music/fashion, but she only wanted to discuss flowers and nature. Then she went in the museum and the only convo I could have was her telling me that looking at the fish on display made her hungry.