The mubarizun unit of the Rashidun army was composed of elite warriors who were champion swordsmen, lancers and archers.
The name "Kensei" means "master swordsman" and "Takezo" is the birthname of the historical swordmaster Miyamoto Musashi – Kensei is based upon various legends of Japanese swordsmen, including Musashi.
Blue Jet (voiced by Shinya Ōtaki) was one of the best swordsmen from the Jet Tribe, and studied under Kirai Stol.
After the end of the war, Gomi completed his education at Meiji University, and began writing popular fiction with swordsmen of the Edo period as his protagonists.
The Khokarsans had a written syllabary, understood the principles of algebra, employed catapults and Greek fire, had an advanced navy of unireme, bireme, and trireme galleys, implemented a solar calendar, and established a samurai-like class of swordsmen called the numatenu who wielded iron broadswords.