I really want to do a collage of all of the best badguys and gals in the land. Every good villain from the anime/cartoons/movies I've seen. Not sure who I would add just yet. Here are some ideas:
Kenpachi Zaraki (Bleach. Villain-ish) Still the best character from Bleach in my opinion.
Ryuk (Death Note) Because of the fact that he was just bored and wanted to see what would happen if he dropped the deathnote.
Darcia (Wolf's Rain) I don't remember much about that show, but he definitely stood out.
Medusa (Soul Eater) I haven't watched the whole series yet, so I'm in store for something more sinister, but she was amazing.
Naraku (Inu Yasha) Because that baboon costume gave me the chills when I was younger.
Creeper (Minecraft) I know it's a game, but this bastard is the WORST! Freaking ninja creepers bombing you from above.
Vicious (Cowboy Bebop) Vicious is a pretty good villain, but what I like the most about him is that he's cool. Almost too cool.
Tonberry (Final Fantasy) I only played a little bit of Final Fantasy, but I hated them and their one hit kills.
Orochimaru (Naruto) Maybe only up to the forest of death... it's kind of lame that all of the villains are "turning" thanks to Naruto :/
Johan Liebert (Monster) I still need to finish this series, but he just has this presence about him that stuck with me.
Desert Punk (Desert Punk) I know he's the hero... but he felt more like a villain to me.
Geese Howard (SNK/Fatal Fury) Because I hated those freaking counter/throwing moves >_<!!!
Greed (Full Metal Alchemist, original series) I liked the fight with this greed a little more, but I do like the one in Brotherhood also.
Grey Fox (Metal Gear Solid) He was a boss till the end. Liquid was... meh. He's OK.
Pyramid Head (Silent Hill II) Pyramid head was the scariest boss I've ever seen in a game. Trapped in a room for five min wit him?o_O
Slade (Teen Titans) No powers and yet he was the one who caused the most trouble for the titans throughout most of the series.
Joker (???) How do I put this? The Joker is a compelling villain in almost all of the shows/movies/games he's been in.
Amon (Legend of Korra) So much potential... and then he disappears in book one. He is NOT dead. The revolution lives on!!!
There are a lot of shows that I've heard had great villains like Blue Lagoon, but I haven't seen a lot of those yet. These are just a few that I remember, but anyways, I'll add more once I remember.