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Earlier Astel was on the topic of derivative works about Holostars (the OG9), he thinks there aren't really much in the fandom and wonders if Holostars aren't selling themselves (well, more like their characters) well enough for people to want to make them (ie coming up with derivative scenarios to imagine the relationships between the characters). Aru's change for example, if derivative fanworks had a stronger hold in fandom, there might have been more excitement about it than apprehension.
I remember he talked about this in menshi once, he asked his fans to make more derivative works but I haven't really seen an increase since then. And I can see what he means, derivative stuff is definitely on the lower end of fanwork output, you more often see normal group pictures or stuff based on streams. I think the most I've seen it from are Hanakishi fans.