The REAL villain in Dark of the Moon is Sentinel Prime. Michael Bay announced that Shockwave was the villian, but Shockwave is only seen about 3 times and plays a very minor role in the film.
Venom
No. Its Megatron.
Centanial Prime
heaps the main one is the fallen
Transformers 3: Dark of the moon
Venom
Shockwave
No. Its Megatron.
megatron
Possibly Galvatron
The Fallen is one of the Seven original Primes that came to Earth to harvest the sun for Energon. He is the main villain in the second movie.
Victor Bronco
Centanial Prime
The main villain in Final Fantasy VII is Sephiroth
Of course, he is the main character. He will be in all Unanimated Transformers Movies. I know because I sort of help them with props and stuff.
Mrs. Danvers, the housekeeper, is the main villain in Rebecca.
A pantomine villain is someone who hates the main character... :)