Gideon is a robot dolphin created by Reno to explore the underwater areas of "Pirate Grove". He has Kokoro and apparently is scared easily. In the end, however, he found courage and bravery.

Built with the original purpose of a deep underwater research robot, Gideon soon after hearing legends of a Phantom Pirate was too afraid to dive.

He is featured in the episode "Gideon" named after him.

2003 series

Astroboy 131 medvid His only appearance is in episode 31. This episode is named after him.