Both Tomiko and Yukihiro are carpentors, but their special talent is a Martial Arts Swimmer, Yukihiro video games expert. Tomiko is a smart alec kind of person and Yukihiro is a cheerful easy going type person. Yukihiro gets called often to fix the Tendo Dojo and house cause of Ranma and his fights with Akane or Ryoga or Kuno etc. Tomiko gets involved by challenging Ranma to a friendly contest of swimming and being the trickster like Tomiko is tricks Ranma to be a girl but the pool is heated so Ranma turns into a boy when he is already a girl. Yukihiro is very strong and if she gets real angry she does her which the madder or angryer you are the bigger the blast. Tomiko's special is the Typhoon Attack, as long as Tomiko has access to water she can create a typhoon and blow everything down with a heavy shower of water.
Ranma really pissed off now knows he still can't beat up a girl, though a girl is beating him up. In the end Yukihiro and Tomiko's friendship end because Ranma