Because you like Rukia Kuchiki in Bleach
If Anna Liebert could remember her past, maybe she would know who she is. See them in Monster (TV Show).
Whatever Sakura Haruno lacks in power, she makes up for in intelligence and bravery. See them in Naruto.
Courteous, dangerous, and powerful, Kaname Kuran controls an entire court of vampires. Very, very pretty vampires. See them in Vampire Knight.
If it means fulfilling her ambitions, Satsuki Kiryuin will show neither shame nor hesitation. See them in Kill la Kill.
After Rintarou Okabe develops the Phone Microwave, some of his fantasies start to seem uncomfortably real. See them in Steins;Gate.
An infamous vampire, Alucard is a one-man killing machine with a philosophical side. See them in Hellsing.
After alien Haruko rides in on her Vespa, giant robots spouting from Naota Nandaba's forehead soon become the least of his worries. See them in FLCL.
China has five thousand years of history, and he's optimistic he'll win over the Allied Powers to the wisdom of his ways. See them in Axis Powers Hetalia.
Fiercely independent and extremely hot-blooded, Ryuko Matoi prefers to work alone. See them in Kill la Kill.
Winry Rockbell is an energetic tomboy mechanic with an empathetic streak. See them in Fullmetal Alchemist.
Vash might act like a carefree, peace-loving goof, but it's not wise to underestimate this "Humanoid Typhoon." See them in Trigun.