Because you like Kallen Stadtfeld in Code Geass
The vampire that killed Zero Kiryu's family also infected him, and he starts to crave blood, much to his horror. See them in Vampire Knight.
The witty Aku would be an ideal dinner guest, if he weren't a demon. See them in Samurai Jack.
Beneath Yuji Sakai's meek exterior lies an exceptionally keen mind and a strong inner will. See them in Shakugan no Shana.
While his twin tries to save lives, Millions Knives does the best to end them. See them in Trigun.
If Anna Liebert could remember her past, maybe she would know who she is. See them in Monster (TV Show).
A laid-back wanderer, Ginko has an empathetic, open-minded worldview. See them in Mushishi.
Gou Matsuoka offers to help as manager of a swim team, believing that they're the only ones who can help her brother. See them in Free! Iwatobi Swim Club.
After several hundred years of shutting himself out from the rest of the world, Japan's not used to dealing with nations, See them in Axis Powers Hetalia.
Everyone is just a chess piece, and Izaya Orihara is a master player. See them in Durarara!!.
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.
Years of being the less desirable Vargas sibling have given Romano quite an inferiority complex, as well as the temper to match. See them in Axis Powers Hetalia.