Nathan

Nathan is Axna and Xirbealg's best friend. He now works with Organization XXI but not as a member.

Story
He lived in Destiny Islands with them (except they were Ana and Gabriel at the time) until they decided to venture to The World That Never Was. There they were attacked by a Twilight Thorn. Ana and Gabriel were defeated and turned into a Heartless. Nathan, terrified and worried for his friends, fortunately knew that there was a chance that they were turned into Nobodies, so he fled to Twilight Town, hoping to find them there. Luckily he did.

Hope
They went to the nearby abandoned Mansion and trained there for two years. They then departed to Yen Sid's Tower, where Xirbealg and Axna became the great Wizard's apprentice. Yen Sid gave them a special mission and a team at their disposal called Organization XXI. They were to become keepers of the peace, but Nathan, feeling that he wasn't powerful enough to be a great asset, declined membership, instead telling his friends that he was just going to help them however he could.