Coming from an underated series, most people have probably not heard of Don Paolo. Though his reasoning for beina a villain is incredibly stupid, it's almost endearing.
Okay, the first thing I have to say about Ghirahim.
He's a damn weirdo.
Strangely however, he's still a loveable character. He has a bit of flirtaion towards link, which is, in my opinion, hilarious to watch.
Pyramid Head fits right in with Silent Hill's rather morbid theme.