5. Big Charlie
With something as horrific looking as this big cow/bird hybrid, you'd be surprised to know that it's not actually harmful towards people. Many theories have been made about this guy, my favorite being that he's an escaped meat processing experiment. I like to think that Charlie's out there, finding and protecting his own herd.
4. The Giants
Easily the most ominous of these monsters, the giants are beyond terrifying. The pictures almost seem to show they move silently, barely being noticed until someone looks up. What's the scariest part is that we don't know their purpose. Some come from the sky and some just wander around.
3. Long Horse
Call me crazy, but I believe Long Horse is the "hero" of the Trevor Henderson mythos. He is completely harmless, only appearing in dreams and gives warnings to people of what's to come. He's mysterious and I love that. If you really think about it, he could be a so called "guardian Angel."
2. Cartoon Cat
If there were to be a show regarding Henderson's monsters, this guy would definitely be the main villain. A cartoon monstrosity that actively seeks to kill and torture people. What's really scary is that he may not be alone, if any indication that Cartoon Dog exists, there may be more of these cartoon monsters...
1. Siren Head
Cmon, how could this guy not be number one? He's what started it all, the popularity, the mythos. When we first saw him, he easily began to break the internet and led to Henderson's rise to internet legend. He easily stands at the top of internet hall of fame, along with titans like Slenderman and SCP 173.