Orochimaru (Serpent Sennin)
Age : 56 (Oct 27, deceased?)
Origin : Konohagakure
the no.1 most hated foe. as evil as it could be, he only has one good point i.e. never gives up. fitted with his name, he really has the look and character of a serpent. to fulfill his sordid ambition, he founded a hidden village, Otogakure, and collected deviate shinobi. Orochimaru is already a deviant since he was a youngster. secretly he abused Konoha shinobi as guinea pigs for his filthy experiment. amazingly, he made to reveal the forbidden jutsu, immortality. however, he needs a new body as a live container every 3 years. thus he chose Sasuke as his next successor. unfortunately hes been underestimating Sasuke who was hiding his true intention. Sasuke attacked Orochimaru and taken over his body. Orochimaru finally died on the hand of Itachi, stabbed by the sword of Totsuka during his duel with Sasuke. therefore now Sasuke is free from Orochimaru's seal.
Age : 20 (Feb 29)
Origin : Konohagakure
a real twisted person, he can fools the others with his smiley face and never shows his true demonic self. though he was a Konoha shinobi, he dedicated his life loyally to Orochimaru. many times he requested, even forced his master to use his body as a live container but it always ends in vain. new surprising fact about this 4-eyed guy, Kabuto is actually the Akatsuki spy who works for Sasori to keep an eye on Orochimaru. after Orochimaru's death he came out in front of Naruto to give him a big surprise. Kabuto has somehow integrated his body with Orochimaru's soul to become someone who even stronger than Orochimaru.
Kaguya Kimimaro (deceased)
a beautiful man who should have become Orochimaru's next 'container', if only he didn't get ill. the last remaining survivor from Kaguya clan, a clan which has a very unique limit blood inheritance i.e. Shikotsumyaku. it took more than 3 men to defeat him, Naruto, Rock Lee, and lastly Gaara. Kimimaro showed his loyalty to his master till his very last breath.
Sakon and Ukon (deceased)
first clue, Sakon is a man. and second clue, he's not alone since he has an alter brother named Ukon. they could merge with someone's body and killed slowly from the inside. Kiba and Akamaru almost met their death on these crazy twin hands. luckily, Kankurou came at the nick of the time and executed them, brutally.
such a girl of my type ^,^ she talked in coarse masculine language and cursed all the time (in Japan, it's very impolite for girls to use masculine language and to curse as well). Tayuya used a flute to create genjutsu with pitch and summoned 3 giant zombies. Shikamaru got totally fu**ed up, yet thank God,Temari came and saved his ass ^_^.
another odd looking shinobi, with 6 hands and 2 legs (the same as spider). he could produce a strange liquid as materials for web and another deadly weapons. Neji risked his life fighting this spider freak (wonder what will happen if he meets Spiderman ^ ^). it was a very heart-moving bout because Neji showed his loyalty to his team mates, for the first time.
rated as the weakest amongst the five Otogakure shinobi. a fatass shinobi who always felt unpleasant with Tayuya harsh language. he used earth/soil element as his weapon. Chouji got his most furious battle with him on his way to retrieve Sasuke. it's for the first time Chouji showed his true strength (a true moving story indeed Y_Y)