Other characters
Saho Shimatani (島谷早穂, Shimatani Saho)
Voiced by: Eri Sendai
Shougo's childhood friend. In the first episode her house is destroyed when the warriors of Nepos Angelis sense that Dragon Bone is nearby. She moves in with Shougo's family and begins to notice the changes in his life, but she feels Shougo is leaving her behind because he won't share his secrets with her. She is a huge fan of UFOs and anything that relates to life on other planets.
Tomoko Ryujin (竜神智子, Ryujin Tomoko)
Voiced by: Minako Kotobuki
Shougo's older sister. She owns a restaurant and uses the funds to help support the dojo her father runs. She believes her mother ran away from the family. She often closes the restaurant to allow the bone adept warriors a private place to conference, though she doesn't know of the secrets of any of them.
Kengo Ryujin (竜神健悟, Ryujin Kengo)
Voiced by: Kazunari Tanaka
Shougo's father. He knows that his wife is alive and that she is doing something private to help protect the Earth, but he refuses to share any of this with his kids until Shougo tells him that he knows his mom is alive. He runs a local dojo.
Kiyoko Shimatani (島谷喜代子)
Voiced by: Yuka Imai
Saho's mother. She oftentimes isn't seen, but when she is shown it is helping to run the dojo or doing laundry for the family after Kengo allows her and Saho to move into the dojo.
Momotaro (桃太郎, Momotaro)
Voiced by: Yūko Gibu
Saho's little dog. He oftentimes is found barking. He senses when warriors from Nepos Angelis arrive and acts as a warning voice should a bone adept not be around.
Anna Christine (アンナ·クリスティー, an'na kurisutī)
Voiced by: Ai Kobayashi
The Assistant Director of the Melbourne Lab. Anna often comes up with weapons to help fight bone fighters once they are in bone form, but she also tries to act as the most cautious voice when it comes to attacking the unknown.
Director Higashio (東尾, higashio)
Voiced by: Akio Otsuka
The Director of the Melbourne Lab. He was the head bone researcher who rescued Victor and Gregory from a war savaged country before they were accepted by Wolf and Tiger. He is usually drunk and believes his words can provide anyone hope.
Leonard (レナード, renādo)
Voiced by: Shintaro Asanuma
The leader of all bone research team for The Lab, both in Melbourne in Australia. He takes multiple trips to Japan whenever new bone data is unlocked to update his records. Currently he's working with Chie Ryuujin to try and unlock the final form of the cocoon and master the hidden powers of Majin Bone. He acts like a typical mad scientist and is nicknamed the demon scientist because of the tests he comes up with.
Ian (イアン)
Voiced by: Hiroshi Yanaka
The Director of the Los Angeles Lab and Luke's father.
Chie Ryuujin (竜神智恵)
Voiced by: Akemi Okamura
The mother of Shougo. She is also the head researcher for cocoon technology for bone research. At a young age she saw visions of the Nepos Angelis Council attacking when Shougo got older, and she knew the Earth would be destroyed if she couldn't come up with technology to counter it. Chie spends her time in space working on the cocoon's, which have to be made in zero gravity. She isn't able to talk with any of her family, outside of Shougo when he is at one of the labs, but she has vowed to return to be with them when the Earth is finally safe.
