| Characters | Age | Brief Description | Transformation | Entrance |
| Ranma Saotome | 16 | A teenaged Martial Artist who never turns down a challenge. He is the star of the series. | Girl | Episode 1 |
| Genma Saotome | N/A | Ranma's Father and Soun Tendo's friend. | Panda Bear | Episode 1 |
| Akane Tendo | 16 | A hot-tempered boy hating kempoist. Ranma's fiancée. She is admired by many boys at school. | None | Episode 1 |
| Nabiki Tendo | 17 | The Middle child of the Tendo family. Strictly a business woman. She knows how to extort anyone for money. | None | Episode 1 |
| Kasumi Tendo | 19 | The oldest child of the Tendo family. She does all of the house work and has an easy going disposition. | None | Episode 1 |
| Soun Tendo | N/A | The emotional father of the Tendo girls. He is also Genma's friend. | None | Episode 1 |
| Ryoga Hibiki | 16 | Ranma's arch rival. He has a very bad sence of direction and it leads him to Tokyo where he falls in love with Akane Tendo. | Black Piglet | Episode 7 |
| Tatewaki Kuno | 17 | Another one of Ranma's rivals, this guy has a real love of himself. He is also one who chases after Akane's heart. | None | Episode 2 |
| Kodachi Kuno | 16 | Tatewaki Kuno's younger sister. She hates Akane, loves the boy side of Ranma and hates his girl side. She is the leader of the St. Hebereke schools Rythmic Gymnastics Club. | None | Episode 11 |
| Happosai | old | A dirty old lecher who finds enjoyment in looking up girls dresses and looking in the girls side of the local bath houses. He is the founder of the Anything Goes School of Martial Arts. | None | Nettouhen Episode 15 |
| Ukyo Kuonji | 16 | One of Ranma's other fiancée's. She carries around a large spatula and dresses like a guy, sometimes. | None | Nettouhen Episode 23 |
| Tofu Ono | N/A | The local chiropractor and Akane's secret love, for a while. He is a master of the body and a powerful Martial Artist. | None | Episode 2 |
| Hikaru Gosunkugi | 15 | A spooky freshman who uses voodoo dolls and spikes as his weapons. He likes to admire Akane from afar. | None | Nettouhen Episode 96 |
| Shampoo | 16 | Another one of Ranma's fiancée's. She is very violent and she has a respect for Amazon tradition, she's cute too. | Cat | Episode 15 |
| Cologne | old | Shampoo's Great-Grandmother; Happosai's old girlfriend. She tends to use everything to her advantage from a twig to Amazon Tradition. | None | Nettouhen Episode 3 |
| Moose | N/A | A boy who is mostly blind but can always see his love for Shampoo. He is the master of the hidden weapon. | Duck | Nettouhen Episode 5 |