Notch: The creator of Minecraft is in single player! Notch spawns on your map, and drops one or two red apples when killed.
Farmer: Farmers wander around your map. Killing them will drop wheat!Planned: He will eventually farm properly and spawn on flat grassy ground.
Lumberjack: These lumberjacks wander around your map. Killing them will drop sticks!Planned: He will eventually spawn in forests.
Miner: The miners wander around your map. Killing them will drop coal!Planned: He will eventually spawn underground.
Psycho: Psychos spawn somewhere in your map. They spawn rarely, but in groups, during the day. Beware! They attack on sight!
Suicide Bomber: Bombers spawn somewhere in the map. They spawn during the day and are a “passive” MOB. But, be warned: They are known to explode on contact. They currently drop TNT, but only if you are lucky enough to get it!