gotta agree with you Cy Dra! xD
Dr. Ivo Eggman Robotnik! (Sonic series) (of course he's EGGMAN!! trying to take over the world with different robots and in the comic world Grand Masters and his very own D.E.L!!!)
Dr. Wily! (Mega Man series) (also... trying to take over the world with different robots... and he's got an army as well? xD seriously what if he and Eggman would've been brothers?!)
Bowser! (Mario series) (he's big, evil, dinosaur... kopa? o-o thingy?? and a king...? wannabe? and he's got his own lackey's and kids and that trusty mage/wizard/witch? xD AWESOME!!)
Maggot Shibito! (Siren Blood Curse) I hate him... so much... =-='' he doesn't give you any peace at all he chases at you, (trying to eat you and or god knows what he's actually trying to do to you!!) He throws stuff at you and that voice is just... ew ew ew!!! think of a newborn baby... and mix that with a zombie's first growl.. and probably mix in a little bit of hobo's drunken voice THAT's Maggot Shibito! oh and did I mention he's about 3 meters tall?! he's disgusting but AWESOME!!
Dr. Neo Cortex! (Crash Bandicoot) he is just AWESOME!! he's one of the most classic video game villains EVER!! (with Bowser, Eggman and Wily of course) he is mad! he is evil! he is THE mad scientist!!
Ansem The Seeker Of Darkness! (Kingdom Hearts) do I even have to explain?! he's evil! he is mad about darkness!! (big surprise here xD) and he is so annoying with that giant Heartless! and for what he did to Riku... he shall be defeated!!
Sephiroth! (Kingdom Hearts version) all I'm going to say is: SEPHIROOOOOOTH!!!!! Dx
King Dedede! (Kirby) my god... how I hated that guy in original Kirby!! when I was a little kid figuring out how to defeat him was a mission impossible to me! (or then I'm just dump.. take your pick)
Spider Shibito! (also Siren Blood Curse) holy-!! was the first and the last thing I said before being killed by one of these! they're everywhere! they won't stop following you, their voices are creeeeeepy... and they jump at you just like that! and they move in groups!
Foxy! (Five Nights At Freddy's) he is Foxy, he's coming to get you, he runs through the hallways and before you know... it is too late... says almost all of the gamers!! xD but seriously I so hate him... (almost gave me a heart attack at the first time)