Across Different Series:
Hiei and Vegita
Kurama and Mikagami
Tasuki and Rubius
Kenshin and Lina Inverse
Wufei and Mousse
Girl-type Ranma and Sherra
Ranma and Tamahome
Sherra and Renhou
Nuriko and Duo
Misao and Hikaru
Gourry and Nakago
Omi and Chiriko
Dryden and Youji
Recca and Keiichi
Yanagi and Yukina
Yakumo and Ryouga
Akane and Amelia
Ukyou and Makoto
Lina and Parfait
Ranma-chan and A-ko
Kasumi and Sylphiel
Within One Serial:
Okita and Soujirou
Gourry and Filia
Xellos and Sylphiel