Gibbon is a male RainWing and one of seventeen kidnapped RainWings who were imprisoned in the Night Kingdom. Kinkajou noted that he might have had very interesting venom, because the NightWings took him very often into their laboratory to study it. When Glory saw him, he was barely conscious, gray-colored, and being dragged by the NightWings to have his venom tested.
At the Night Kingdom, Glory sees Gibbon, a prisoner, being taken to the fortress for venom testing. According to Glory, his scales were a dull, heavy gray, the color of sorrow and great unhappiness that she had never seen before on any RainWing. He hung limply between the three NightWing guards who took him out of his cave, neither helping nor hindering them. Kinkajou says that he was often taken for testing, and that his venom must be "way more exciting" than hers or any other RainWing's.
Kinkajou later argues against the RainWings' doubt of Glory's decision to challenge the queen for the throne and says that they should ask Gibbon, Orchid, Splendor, Tualang, or Loris what they thought and then revealed that they, along with several other RainWings, were all imprisoned in the Night Kingdom, with the exception of three of them who had already died. Several dragons looked around expecting to see them. This shows that few RainWings knew of the kidnapping and no one cared.
He later reappeared when Glory's army attacked the Night Kingdom, freeing all the RainWing prisoners.
"The RainWing's scales were a heavy gray, like rain clouds; it was a color of sadness Glory had never seen on any other RainWing. He was conscious but neither struggled nor helped the NightWings. He just hung between them like he'd given up completely." -Glory seeing Gibbon for the first time
"Poor Gibbon. They take him all the time. I guess his venom is way more interesting than mine or something." -Kinkajou about Gibbon
- A gibbon is a small, slender tree-dwelling ape with long powerful arms and loud hooting calls, native to the forests of Southeast Asia. They can be dark brown to light brown.
- Gibbon may have strong venom, as he was studied often.