Medical officer on board the Cha-Cha Maru, Mei Lin Jones is charged with the health of the crew. The medical talents of this stunning beauty is tested to the limit, especially when Tita is gravely injured at the hands of Guizel. In the manga, Mei is depicted as a sister figure to Tita; Tita was raised as part of Mei's family after her father died. It is also revealed that Mei once saved Tita's life when Tita was suffering from a deadly disease called 'Ietta Fever.' Source: Wikipedia
Doujima is portrayed as as carefree, lazy, vain, and immature; and she would sooner go shopping than go on a mission any chance she gets. She is consistently late for work and rarely does anything around the office, getting much negative attention from Kosaka. According to her, her parents had STN-J act as her "caretakers" and have the authority to get STN-J in trouble. She is a disappointment to the other STN-J members most of the time by doing the most minimal work during missions, and ditching them immediately when her task is finished. Doujima does not warm up to Robin at first and mockingly calling her "Amon's Girl," but toward the end of the series she begins to take a liking for Robin calling her "Little Robin." She also begins to do a little more work and proves she has more insight and perception of her surroundings than originally presumed. Revealed to be a Solomon intelligence operative, Doujima was sent by Solomon to the STN-J to uncover more information about the Orbo. In the end, she escapes the Factory with Nagira, who hid Robin after Amon saves her. After the attack on the Factory, she finally begins doing a good job in hunting witches.
The second in command. Miho is a 19-year-old hunter with the gift of psychometry, which is the ability to read people or past occurrences from objects merely by touching them. She can also see past events that happened to, or around, an item or place and uses this power when examining evidence or crime scenes. Miho gives Robin advice on how to improve control over her power and also acts as her mentor.
Touko shares her apartment with Robin. She doesn't work for STNJ. Touko and Amon might have been closely involved at one time but things between them have changed.
June's rival for the crown and Sejuru. She was originally ranked first place as a Queen Candidate, but is soon surpassed by June. Lucia has been raised since childhood to become Queen of Light, so she possesses a regal manner and shows little emotion. She feels lost when June so easily surpasses her and begins to question if she really wants to become the next Queen of Light. Source: Wikipedia
The target of Lord Guizel's search, Ellyse Aldomordish had escaped the gravity belt complex with the aid (and ultimate sacrifice) of her father, Nalderof Aldomodish. Her last twelve digits of her D.N.A. sequence, decoded using the BRG method, is the code to unleashing the Gravity Destruction Ray, a potent weapon created from one of the gravity belts which could destroy the island colony. When she was first rescued by Tita, she was more than a little bashful, even when Tita invited her to the Cha-Cha Maru's bathhouse (and VERY embarrassed when Tita accidentally fondled her when she helped her undress for that bath). However, as time when on, she began to trust her. However, in the end, Ellyse decided to go back to the colony to continue her father's work. Source: Wikipedia
Leeron, or "Ron," is the flamboyant village mechanic of Littner Village. After taking an interest in Simon's mech he joins Simon, Kamina and Yoko in their quest to defeat the Beastmen.