I've been playing this game for ages trying to see if you can actually be moloch. And i have found a way. Do the following:
1. If you have unlocked a character by buying them from the krypt, delete every profile on the game.

2. Once you've created your profile, go to game options. Put difficulty MAX, Blood level NONE, every mini game every 3 rounds, round time INFINITY.

3. Go to konquest mode and complete your training. Then beat konquest mode with all the characters,(not the ones who can be unlocked).
Then go to arcade. beat arcade with every fighter you have (not the unlockable people) without losing a match. (be careful because it's on MAX). and beat every test your might and sight.

4. Once you've done that go to arcade and keep winnning money. Once you have enough money buy every character in the krypt. you can find their koffin letters on the internet.

5. Once you've unlocked every1 beat konquest mode. You will unlock 2 new people mokap and blaze. Beat arcade with them WITHOUT losing a match. Then go back to konquest and beat it again another 5 times.

6. Once you've done that, keep beating arcade until you have over 30,000 koins of every color.

7. After that beat konquest once more. Then reset your missions.

8. Once you've resetted your missions choose drahmin. get up to the training bit where you have to break the diamond. Once your up to there DO NOT BREAK the diamond. instead lose. Then raiden will come and say " The deadly alliance has revived the long forgotten army of the dragon king. We have failed. Shang tsung has consumed the souls of every one of our forces.
But Quan chi has betrayed shang tsung since there is no need for him. Shang tsung has now joined us in an attempt to stop Quan chi. We must defeat him. Moloch is also with shang tsung, waiting for mortal flesh. He has agreed to help us defeat Quan chi, in return of unlimited souls. Wer have accepted his offer. Please, we must stop him. We must stop Quan chi!"

9. Once he has said that, go to arcade. highlite reptile and press down. Instead of choosing reptile Moloch will appear. You will be able to use him in arcade but no other modes like konquest or practice. you will only be able to use moloch if the difficulty is set to max.

10. Moloch does not have a moves list. you must figure out his moves your self. But i have been using moloch for quite some time and have found some of his moves.

left, right, triangle= ground punch

right, right square= air breathe in

left, down, left X= throw(pick up and smash)

square=boulder hit


and thats all the moves i know for moloch ill post some more soon once i find out!