Well there's tons of videos of them on the Internet like you could try searching for them on:
YouTube cuz that's mostly where I got some of them. And Entity303 is a fired Mojang employee that wants to get revenge. And Entity404 Im honestly not sure about what he's supposed to be. The Blood Golem is a giant iron golem but is red and kills villagers and players. And you can summon by putting iron golems in the nether. And there are a few that wasn't even on my list like giant Alex, giant Steve, and Siren head.
