Genma Saotome is Ranma Saotome's father and the sensei of the Saotome Dojo of Musabetsu KakutÅ� RyÅ« karate ("School of Indiscriminate Grappling", more commonly known in the West as "Anything Goes Martial Arts"). During the time when Genma took Ranma on a decade-long training voyage to improve their martial arts skills, he insisted on going to Jusenkyo in China - a place which he believed to be a training ground. However, because of Genma's ignorance of the Chinese language, he did not realize that the ground was unfrequented because it was cursed. Genma realized all too late the mistake he made, after his son knocked him into a cursed spring during this fateful training session. Genma was knocked into Shonmaoniichuan (熊猫溺泉 XióngmÄ�oníquán), the Spring of Drowned Panda. Due to the nature of the Jusenkyo curse, a victim who falls into the spring is cursed to turn into who or whatever drowned there when doused with cold water. Thus, whenever Genma is splashed with cold water, he becomes a giant panda. Hot water, as with the rest of the Jusenkyo-cursed characters, can change him back into human form. Despite the fact that he and his son were cursed, Genma still brought Ranma back to Japan to fulfill a marriage engagement with his longtime friend and fellow martial artist Soun Tendo, the terms of which were as follows: Ranma would marry one of Soun's daughters and carry on the Anything Goes School of Martial Arts. Genma and Soun decided that Soun's youngest daughter Akane would one day marry Ranma after Akane's sisters made the ruling on their own — against their will, at least at first. Genma currently resides in the Tendo Dojo along with Ranma, in the hopes that one day Ranma and Akane will get married and fulfill the agreement made by the two families. He spends most of his time playing Go or Shogi with Soun, although he briefly had a job at Dr. Tofu's clinic. Unlike Ryoga, Mousse and Shampoo, Genma automatically regains his clothing when shifting back to normal, despite being too large to keep them in cursed form. The only other characters who shares a similar trait is Pantyhose Taro. Occasionally, primarily in the earliest stories, the top half of Genma's gi and his glasses will also remain on him when he turns into a panda. Taken from Wikipedia
The second daughter of Soun Tendo. The most important thing to her is money and she'd do anything to achieve it, including blackmailing her own family members. In some stories, she plays an important role in trying to extort money or placing bets just for her own amusement. She has a sarcastic, materialistic, egoistic, manipulative, sadistic and completely amoral attitude that is a sharp contrast to her older sister. She can in fact, be seen as the most intelligent character in both manga and anime.
Soun is the head of the Tendo household and one of the two families to practice Anything Goes Martial Arts. He's a widower, left to single-handedly take care of his three daughters. He has a large house that is occasionally in need of repairs due to the fights that take place there. While he owns his own dojo, students have not been explicitly shown. Community representatives frequently approach him when they have problems with unusual phenomena, so this may provide some of it, and he has rented out the dojo for social meetings. However he is shown to be quite careful with the expenses and gets upset when Nabiki spends his savings on expensive gifts, or when Ranma throws the dinner on the floor. In the anime, he spends most of his time playing Shogi with his old training partner Genma. Soun is eager for his daughter to say she loves Ranma, or the other way around, to continue the legacy of his school. He'll start announcing wedding plans if Ranma and Akane seem romantically involved. Soun is able to manifest himself as a ghostly, floating oni head, whenever he is upset, and often cries "Oh, the humanity!" in the anime. He generally assumes most incidents are Ranma's fault. He's shown as extremely protective of his children, and becomes sad if their affection is in doubt. Miss Hinako is attracted to him, but he is very loyal to his dead wife and visits her grave in memorial. (Wikipedia)
He is a Cloudian who was a rare species of alien race who posses vast amount of knowledge of the universe. He resides in a castle atop of a giant cloud. He tires seduces Scarlet at first but was first interrupted by Dr. Gel and then Dandy. He is also Honey's half brother (Source: Anilinkz Forum, edited)
An agent of Section 2. Henrietta's handler and Jean's younger brother. Unlike the other fratello (sibling), José truly lives up to the name, caring for Henrietta like a protective brother and showing a good deal of interest and concern for her welfare. As such, he attempts to minimize Henrietta's conditioning as much as possible. Years ago, José had a younger sister who adored him and wished to join the Carabinieri when she was older, in order to protect him. She resembled Henrietta somewhat and died in a terrorist attack which possibly caused her to drown. Due to his sister's death, José gained a deep appreciation for life and a hatred towards terrorism.
Real name Marco Togni. An agent of Section 2 and Angelica's handler. After being suspended from military service due to an injury to his left eye, Marco was recommended by his friend Dr. Bianchi to be the handler of Angelica, the first child assassin of Section 2. While taking care of Angelica, Marco told her stories of "The Prince of the Land of Pasta" a fictional prince who ate only pasta. He spent much time looking for ideas for the story. This fascinated his girlfriend at the time, Patricia, who later wrote and published the storybook "The Prince of the Land of Pasta", a copy of which Marco bought and read for Angelica. As time went on, Marco witnessed Section 2 develop into an effective combat unit and Angelica's tremendous potential as an assassin. Sadly, Angelica also was the first girl to experience the side-effects of the conditioning process, particularly long-term memory loss. Disgusted with the many setbacks that resulted afterwards, Marco felt that any further effort was in vain, and had no desire to continue, and takes an impersonal and critical approach to Angelica's training.