"I'm Ooi, the 4th ship in the Kuma-class light cruisers. I was born in Kobe. I'm an active practice ship at the Navy School, you know? Of course, I'll change into a torpedo cruiser if I need to fight for real. Nice to meet you!" - Ooi (Source: Kancolle Wikia)
Annie is Candy's childhood friend. When Annie was ten she was adopted by a wealthy family that had lost a daughter.
Stear is the elder brother of Archie. He often invents objects which don't work correctly but make funny scenes. After each failure of an invention this never weary inventor works on its improvement or on another new invention. Stear is a good-natured, intelligent, creative, unperturbed, mature and pensive character. He loves Candy, too, but understands already since the beginning that his love can only be hidden and kept in his heart. When the First World War begins, he joins the air force voluntarily and fights for France. (Source: Bestanime)
Iwao is Ryo’s father and the current master of the Hazuki Style martial art. He is a character of high morals who respects devotion to one’s convictions, proper manners and above all, trust. He is very calm and composed, personifying simplicity and courage. His only hobby is Shodo (calligraphy) which he often uses when writing letters and postcards. As a master of martial arts, he is a strict Sensei and is never satisfied with relying solely on one’s natural talent. He has continued to adhere to a strict training regimen throughout his adult life. When he was young, he is said to have set out on an overseas journey to learn from the various great masters of the martial arts. Although his son Ryo sometimes rebels against his strictness, he still respects him as a mentor and dreams of emulating him. -Versus Books vol. 20
A boy in Makoto's class. "I" meets Saotome in town and they become friends. They decide to go to the same high school and start studying together since they both have bad grades. Saotome may not be very handsome, but he'll always talk to anyone regardless of whether they're being bullied.
Dr. Gero (ドクター・ゲãƒ, DokutÄ� Gero?) made himself into a cyborg by implanting his brain into a robot body. He first appeared with Android #19 to kill Goku. After #19 was destroyed by Vegeta, he fled out of fear and with the intention of activating Android #17 and #18. Once he activated them, they quickly rebelled on their creator. #17 kicked his head off and crushed it. [spoiler]After the Red Ribbon Army was defeated by Goku, Dr. Gero goes into hiding in his laboratory located in a mountain area north of North City. In this lab, he strives to create the ultimate fighting machine. Using an extremely intelligent tracking device disguised as a ladybug, he studies Goku and the Z Fighters for years, observing the fights Goku has with Tien Shinhan, King Piccolo, Piccolo, and the Saiyans Raditz, Nappa and Vegeta. Dr. Gero ceases the study of Goku's power when the Saiyan leaves for Namek, believing he had already compiled enough information; so he simply adjusts the androids' power levels to accommodate for Goku's expected power increase, not accounting for the power level of Goku's Super Saiyan form. Believing he had created the ultimate fighting machines, he finalizes his plans and constructed a series of Androids. Android 16 was modeled on Gero's dead son, a high-ranking Red Ribbon soldier long ago felled by an enemy bullet. In his affection, Gero made him powerful, but did not want him to be destroyed in battle, so he made him gentle. While looking for fresh material for his experiments, Dr. Gero meets two notorious delinquents by chance, two siblings, a boy and a girl. He then kidnaps them and restructures them into Android 17 and Android 18. However, the two became rebellious as they retain their human free will, so he deactivated them. In Dragon Ball GT, he helped Dr. Myu create Super 17, who later went on to kill both of them.