Birthday: I don't know- it depends on whether you mean Onigumo's birthday or the day Naraku became a hanyou
Bloodtype: I don't know, but I'm guessing B
Time Period: Sengoku Jidai
Personality: calculating, cold, cruel, pensive, guarded, mysterious
Favorite "food": powerful youkai
Likes: playing with people's emotions, manipulating people, power, baboon/monkey suits
Dislikes: being a hanyou, spider tattoos
Wants more than anything: to become a full youkai
Weapons: kugutsu/puppets, Saimyoushou, detachments
Description: He was originally Onigumo, a man who was unable to move but desired ^_~ Kikyo, who tended to him while he was paralyzed in a cave. Youkai were attracted to his dark soul and so he allowed them to consume him and many, many youkai later, he became the hanyou Naraku. He has a spider on his back and no matter how many detachments he creates from himself (kinda like mini me's), they all have the spider on their backs as well.
He wanted the Shikon no Tama and so tricked Kikyo and Inuyasha into thinking that they had betrayed each other- which also could have tainted the Shikon no Tama with their hatred and made it more evil, but that didn't happen. He wanted the jewel and Kikyo for his very own.
He has his Saimyoushou, poisonous bees travel around to keep an eye on things for him. He put the spell on Miroku's grandfather and is toying with Sango's dead younger brother. He is gathering as many of the shards as he possibly can and is extremely powerful- even being a challenge- I don't how little or much- for Sesshoumaru.