INUYASHA!!

Some info on this cute guy:

Son of a taiyoukai (great demon) and a mortal woman, and has a full-demon half-brother, Sesshomaru, Inuyasha wishes to become a full demon. In order to do this, he needs the Shikon no Tama (Sphere of the Four Souls). During an attempt to get the Shikon he was sealed by Kikyou the priestess of the shrine. For 50 years he has been sealed in the magical forest called "Inuyasha no Mori" (Inuyasha's forest), until Kagome broke the seal and set him free. Inuyasha and Kagome must team up to restore the Shikon no Tama that accidentally gets shattered. Being a half-demon, Inu-Yasha has 'his time of the month' where he reverts temporarily to a vulnerable mortal body: the new moon. His feelings for Kagome are a strange combination of scorn and... affection? Inuyasha seems very cold and heartless at first, but he actually is a very caring half-youkai. He promises to protect Kagome no matter what, however he carries a lot of guilt over the death of Kikyou and turns his affection towards her when she reappears, thus the tortured love triangle.

I'm a kind-hearted soul...right?