- Voiced by: KENN
The male lead and the last of the Yagyuu. He joins Ame on her journey.
- I Am a Monster: He claims he is just as much of a monster as the Shinobi.
- Last of His Kind: He is the only known remaining Yagyuu.
- Mystical White Hair: Sanda notes that his white hair is proof of his heritage of the Yagyuu.
- Super Soldier: He is a Yagyuu, a humanoid weapon created to destroy the Shinobi.
- Star-Crossed Lovers: With Ame at the end.
- What Beautiful Eyes!: Ame thinks so, saying they are proof that he's not the monster he thinks he is.
- Voiced by: Megumi Han
The female lead and the princess of the country Ise. She is on a journey in search of the Giga Road.
- Anguished Declaration of Love: While it couldn't be heard at first, the end reveals that she gave one to Suou to stop his rampage.
- Fallen Princess: Her country has already been laid to waste by the Shinobi by the time the story starts.
- Star-Crossed Lovers: With Suou at the end, as she is nowhere to be found after the final battle.
- Voiced by: Unshou Ishizuka
A old swordsman serving Ame.
- Old Retainer: For Ame.
- Heroic Sacrifice: Holds off a horde of Shinobi so that Ame can get to the Giga Road.
Hana, Yuzu, Rin, and Eri
A quartet of girls travelling with Ame.
- The Leader: Hana seems to be in charge of the other three.
- Voiced by: Kosuke Toriumi
The young leader of the nation of Tora.
- Voiced by: Tomo Saeki
A soldier working under Shin.
- Voiced by: Chihiro Suzuki
Another soldier working under Shin.
- Voiced by: Shuta Morishima
A scholar from Ise.
- A God Am I: He seems to have attained this mindset after acquiring the power of the Shinobi.
- Big Bad: He let the Shinobi destroy Ise and is using their power to try and create a new world.
- Mad Scientist: He intergrated Shinobi cells into his own body.
- Treacherous Advisor: He used to teach Ame when she was little, but now uses her for his plans.
- Walking Spoiler: His status as the Big Bad.