The Keroro Seed is an item featured in Keroro Gunso Movie 5: Creation! Ultimate Keroro, Wonder Space-Time Island, de arimasu!!.
The Keroro Seed is first seen as a moai statue, Alisa gave to Fuyuki. Fuyuki found it suspicious that it looked a lot like Keroro. The statue in the end turns out to be Keroro's spirit, thanks to Io saving him from Akuaku, and Fuyuki had to plant the statue, to make Keroro into Makemake.