Jake

Jake is a sociopathic Lego steam engine who occasionally worked on the North Western Railway. He's dead now, lol.

Biography in the SC Shorts
Jake first appearance in the SC Shorts in the pilot episode, "It's a Special Day on Sodor!". He was seen on 'Arry and Bert's freight train on top of a hopper car. He was due to be taken to the smelters to be scrapped and begged 'Arry and Bert not to take him there, saying that he was formerly a diesel locomotive and then later became a steam engine. However, the two diesels ignored him, and took him on his way to his impending doom anyway. Later on, 'Arry and Bert had a crash and Jake thought that he would be living for another day, until Jock fell down from the sky and landed on top of Jake, presumably killing him. However, this fact proved to be wrong when he mysteriously showed up in "Snowy Sodor" and was proved to not be dead.

Sometime later, a new Lego engine character named Joseph was introduced, and it was revealed in the episode, "This Has Nothing to do With Halloween" that Joseph was made using the parts of Jake and Billy Shoepack. This later led to Jake and Billy being turned into some sort steam generator thingy. And like all of the other characters in "This Has Nothing to do With Halloween", Jake out for revenge and tried to fight back the crowd of characters, but ended up getting dismantled and crushed by Scoop in the process. This was the last time that Jake was ever seen in the SC Shorts, so it's presumed that he was permanently killed off this time.

Personality
Jake is good hearted at times, but also vengeful and crazy.