The Sun Giant is a giant robot in Dark Cloud. It was created by the Moon People's inventor, Osmond. It is featured as the Georama for Yellow Drops, and must be rebuilt in the town's Moon Factory.

Osmond designed a prototype of the Sun Giant, but the power source needed to generate it can only be won as a prize in the Coliseum. Its parts were scattered across the Moon Sea by the Dark Genie, so Toan must recover them with his Atlamillia. When Osmond hears of Toan's plight, he decids to change the Sun Giant's mission to defeating the Dark Genie. Once the Sun Giant is reassembled and the power source installed, Toan and the crew head for Dark Heaven Castle.

The Sun Giant is no match for the Dark Genie's power, and its crew is scattered across the sky. Toan and Osmond are saved by Dran. No one knows what happened to the rest of the crew, though it is stated that the thick clouds below may have cushioned their fall. Neither the Sun Giant nor the crew is ever seen again.