Fullmetal Alchemist: Brotherhood: Bring It On

Alex Armstrong and Olivier Armstrong staring angrily while covered in blood

Don’t mess with Major General Olivier Armstrong or her younger brother Major Alex Armstrong.
From the anime series Fullmetal Alchemist: Brotherhood


Gakusen Toshi Asterisk: Students of the Yellow Dragon

Shenhua Li and Shenyun Li wearing pink fighting clothing

Shenyun Li and his younger twin sister, Shenhua, are both arrogant and ruthless but highly skilled fighters who enjoy making their opponents suffer in the arena.
From the anime series Gakusen Toshi Asterisk (The Asterisk War: The Academy City on the Water)