Daku is the spy and assassin of The Yamoni Empire. Daku is the secondary protagonist from BOOK 1 to BOOK 9. Daku also contains all of Daisen's intelligence and pride. Daku speaks in a peaceful tone, and he is also very arrogant.
- Daku is known to be a far darker reflection of Daisen himself.
- Daku means "dark" in Japanese.
- Daku was also the second robot built out of all the Yamonis