Ghost Train
Final Fantasy 6

Evil: Not really, just wants to do its job to ferry the dead and you just try to stop it
Insanity: Hard to say, it only has a few lines
Powers: Transports ghosts to the afterlife, 100% chance of ACID RAIN
Occupation: Ferries the dead to the afterlife

Description: Time to get a little silly, this boss from FF6 has been subjected to an internet joke solely because of an ability that you can use against it, Blitz: Suplex. The joke is how the hell is anyone strong  enough to suplex a train? Apparently Sabin is.

I once saw a comment in the YouTube video that showed the suplex and the guy said
Cyan: Sabin we're supposed to be running away from the train! What're you... HOLY SHIT Sabin!
This boss seems completely random and doesn't seem like it was exactly necessary to the game. It sort of became a lesser known internet meme because of

 This

 

 

Isn't that funny how a guy can just suplex a big ass train like that? The train itself is not at all evil, it just wants to do it's job without delay. Fortunately this sometimes difficult fight can be simplified, the train is characterized as an undead so you know what that means in the Final Fantasy world!

Ok I just couldn't resist the arrow to the knee joke when I saw this picture in Google images. Anyway, it was not until Final Fantasy 8 when a new ghastly train made an appearance, which bears little resemblance to the Ghost Train, but both are undead, and have status attacks.

Doomtrain, a GF. He is the deadliest motherfucker against some humanoid enemies and he can cripple Fujin and Raijin to the point that you practically won

Dr. Evil