Alright, so most of us know Tremor, the brown ninja with earth powers. His first and ONLY appearance was in the flop of a game Mortal Kombat Special Forces. Now, possibly due to the fact the game was a complete flop, none, and I mean NONE of the characters introduced there have EVER reappeared, not even in MK:D's Konquest mode (although, of note, he is subtlely referenced, as all the Lin Kuei trainees have brown Ninja suits). While Mortal Kombat Mythologies, whch was released earlier, introduced Shinnok and Quan Chi, two popular and criticl characters in the series, as well as Sareena, Jataaka, and Kia. Sareena has had two playable appearances in other games since then. Mortal Kombat Tournament Edition for the GBA, and MK: Armageddon. She also made an appearance in MK:D's conquest mode. WHile the other two made non-playable appearance's in mortal Kombat Armageddon, still working for Shinnok.
Now back on topic, MKM: SZ wasn't that good, but it wasn't a flop like MK:SF, and the like of the game may have been wwhat allowed these characters to appear again. On the topic of Tremor, I found him to be one of the most interesting one-shots of them all. Not because he's a ninja, but because of a simpler reason: His powers.
Now, Mortal Kombat has people wth all kinds of abilities: Fire, Ice, Acid, Shapeshifting, Soul stealing, acrobatics, turkey impressions, the list goes on. But on of these things have NEVER been brought up, the power over earth(due to the fact tha I watch avatar and it's easier, I'm gonna call this earthbending.) Now, earthbending, to my knowledge, s very uncommon in a fighter. Besides Jax's ground pound move, nothing like it has never REALLY been explored, and in SC, no one can earthbend, in Tekken, no one can earthbend, in Street Fighter (I don't play it) No one can earthbend correct me if I'm wrong. The closest thing we've had was Hulk in Marvel vs Capcom.
Mortal Kombat is going into uncharted land here. Earthbending is very rare in fighting games, and Mortal Kombat, being one of the first, has the ability to mold it in any way they please, this could include, but not be limted to, throwing boulders, like sektor's homing missles, the ability to control earth and ahve it seek out an opponent, a ground TREMOR, sort of like ground pound only with a higher range. Hell, he could even go into a seperate stance for a few seconds like ermac's levitation.
Here's another reson, he has untapped potential in terms of story. A Lin Kuei ninja who betrayed them to join the Black Dragon, taht automatically gives him ties to the following: Kano, Kabal, Sonya, Sub-Zero, and maybe even, Kira and Kobra, Jarek, Scorpion, Forst, Noob, and Smoke. As wel as the fact that since MK:D the Black Dragon clan was thriving, he could go anywhere, from back to the Lin Kuei, to Outworld, maybe even form his OWN alliance, or be a loner like Scorpion.
Finally, we have design, originally, Tremor had a slightly different ninja chestplate (whatever you call it) and was slightly taller and bulkier than the other ninja. However, it has been 8 years sincehis last appearance, and it's probably gonna be more, but in that time, he could get a COMPLETE OVERHAUL in terms of design. remember Rain? Yeah, his look sucked, and still hardy anyone likes him. Remember Ermac? His redesign was great! They could easily do that for Tremor, or even take away his ninja look entirely. Hell, He could be a sub boss in MK9 for all we know, his design is limited only to the MK team's imagination. I even made a concept for him in soulcalibur IV with the image that he WOULD be a sub boss for MK9 here it is.
So in conclusion, everything about Tremor has great potential and the ability to succeed and go places in the MK world. His untapped prowess in terms of story and powers, plus the ability to give him a completely new design, makes himn a great candidate for MK9.