characters dark side

I would have to say Lucy and Nyu,that is order Lucy small eye and Nyu Big eyes, from Elfen Lied the Bloodiest and Goriest anime u will ever watch

Honi Senpai from ouran, he might look cute but when he's mad U BETTER WATCH OUT!

Father Able Nightroad - Trinity Blood
He has a serious dark side!

kyo(Skip beat) is very ify there

Hmm..I'm not sure if this is what u mean but this is Dark Marik from Yu-Gi-Oh!..he's Marik's dark side but they are kind of separate but he was created from Marik's Hate and Anger towards the Anonymous Pharaoh and making him wait so long and him being a tomb keeper..he even sent his father to "hell" also known as the shadow realm in the english dub.

Shion from higurashi

tobi's not always a good boy....he has a dark side tooo....

um...well there IS this guy from my favoriete anime who got possesed door Dark Power... i know. O_O Dark Power. never mention it. whatever. XD
anyways, he battled this guy, thought he had a strategy, totaly failed, then....oh man it was scary. HE GOT POSSESED!
anyways, he broke free of the dark power at one point, wich kinda ruined it.
i mean, watching him all evil makes u want to run and hide at first, but after watching it a million times, u get used to it, it isnt scary, and it just plain fun to watch. :D
NOT MENTIONING CARACTER of ANIME! ._." im a little embaresed cause some-ok, most- think its stupid...

Hatsuharu sohma
doesn't he have a dark side (black haru)

Light Yagami from Death Note..

I don't want to spoil the anime if u haven't watched it..so I'll leave it at that.. ^-^

Sasame from Pretear.
At the beginning: u did fine, Himeno. Keep working hard! *smiles and freaking rainbows*
Nearing the end: u will all die if u do not embrace the Princess of Destruction's will.

link

Saya from Blood + She can be really sweet but look out! Good toon too!

Russia from Hetalia!

Shirosaki is Ichigo's darkside

Zero Kiryuu from manga/anime/light novel Vampire Knight.He is a vampire hunter but this is his vampire side

Heres another one of Kyoko from skip beat

Sakura from fate/stay night

mirajane

This probably doesn't count as anime, but he's the only character I thought of. Dang, I need to watch meer anime. Link and Dark Link.

Envy

Saeko Busujima Of HOTD...

she's a total sadist and loves killing so much..but she's still sweet...:)

Sawako-sensei from K-ON XD
and i am truly sorry for the sounds, i wasn't bothered to find a pic/better vid