A shrewd, powerful, but ancient sorcerer, Zoken is patriarch of the Mato family and is known to be the grandfather of Shinji and Sakura. He has amassed a large and extensive library of sorcerous knowledge, yet his lessons are strict and harsh. Zoken considers Shinji to be a disgrace of a sorcerer, and believes Sakura may have more potential than her brother. (Source: Wikipedia)
A former Solar Federation spacecraft designer, Mr. Zone lost his job when Harlock, then a Federation captain, declared that his ship designs didn't offer adequate protection for the crew. Zone's career as an engineer died, and ever since he's sought an opportunity to give Harlock a little payback. After earth was conquered by the Illumidas, Zone saw his chance and offered earth's new rulers his services as a hired gun and spaceship designer. With his help, the Illumidas create better fighting vessels with which to combat the pirate, though secretly Zone also wishes to see the earth free of the Illumidas, as well. Early on, Zone comes into radio contact with the Queen of Arcadia, though he does not realize who she is. Gradually the two form an alliance, though it falters when she begins to suspect Zone's duplicitous nature. When Zone returns to earth bearing her gift, the fire of St. Aqule, he uses it to eradicate the Illumidas Occupation Force before turning his attention back to his old nemesis. Harlock appeals to Zone's better nature on behalf of the beleaguered earth, and Zone saves Harlock from Vice-Commander Garron during the final battle, possibly deliberately, possibly by accident. (Source: cornponeflicks.org/harlock/enemies.html)
Jiro is a headstrong kid that is set on revenge for all of the destruction Nene has caused. It has been assumed that Nene may have burnt down his village and taken his entire village (or kids) hostage, just like what happened with Shu's village. Jiro is constantly causing rifts between him and Shu, just to make their rivalry that much more of a "rivalry." He has been traveling with Zola for some time now and knows about "The Book of Origins" and the history of the Seven Warriors of Light. He is the complete opposite of Shu, leading them to their rivalry. But the one thing they both have in common is that they both have the strengh and willpower to defeat the Grand Kingdom if they try hard enough.
Chiharu is Tatsuya's and Mai's father. He is always away, because he is on various treasure hunts and adventures. He can be associated with "Indiana Jones", because of his looks and profession.
Jin is Natsuki's older brother and is also one of her co-workers at the restaurant that their father owns. He constantly makes his sister angry when at work which gets him thrown out of the restaurant, usually breaking a window on the way out. Everything he breaks due to this act is taken out of his paycheck.