Because you like Fakir in Princess Tutu
Yuri is living in the afterlife, which takes the form of a high school where no one dies. But if you follow the school's rules and live a "normal" life you vanish. See them in Angel Beats!.
Shana is a red-haired warrior with a black-and-white worldview. See them in Shakugan no Shana.
England may cultivate the image of a well-bred gentleman, but he has both the temper and mouth of a seasoned sailor. See them in Axis Powers Hetalia.
Nozomu's name translates to despair, which is fitting for him. See them in Sayonara, Zetsubo Sensei.
A laid-back wanderer, Ginko has an empathetic, open-minded worldview. See them in Mushishi.
For the sake of science, Kurisu Makise will persevere no matter how deep into the dark secrets of the world she finds herself. See them in Steins;Gate.
Firo Prochainezo is swept up in a world of mysterious women, alchemists, and rumors of a wine that makes it drinkers immortal. See them in Baccano!.
After Rintarou Okabe develops the Phone Microwave, some of his fantasies start to seem uncomfortably real. See them in Steins;Gate.
Misaki Nakahara is keeping tabs on her newest project: recluse Tatsuhiro Sato. See them in Welcome to the NHK.
Years of brutal winters, foreign invasions, and crippling loneliness have left Russia's mental state far from wholly intact. See them in Axis Powers Hetalia.
Konata Izumi has a live-now, worry-later view of the world. See them in Lucky Star.
If Anna Liebert could remember her past, maybe she would know who she is. See them in Monster (TV Show).