Found some. A company called Kopf makes them. Kopf make a range of knockoff and original minifig designs compatible with Lego. The Astroboy ones are shown here:
https://downtheblocks.blogspot.com/2019 ... eview.html
![minifigs.jpg](./download/file.php?id=13303&sid=51326b69ba0ebd00e6c1b1a96bdfc221)
- minifigs.jpg (101.05 KiB) Viewed 2497 times
I bought a set through an Aliexpress store called
CHEERING Minifigures Store but they don't appear to list them anymore. Maybe they got pulled for being unlicenced? If you're desperate you could contact them and ask if they have any remaining stock. Honestly the quality was kinda janky though. They don't come with arms attached, and one of mine had two left arms.
I found another store here that seems to sell them:
https://www.minifiguresmall.com/single- ... 43385.html I haven't shopped there before so I don't know what they're like.