Reptile should have always been a ninja. I don't know what the character designers were popping in their mouths that made them think that Reptile MK4 looks decent enough to release to the public. His fatalities have always been pretty cool, but I hate how they have changed him. Playing with him in MK DA makes me feel like I'm playing Primal Rage; I mean, he's huge. Anyways, I think what killed his ninja style was the repetition of these pallate swaps in all MKs, until UMK3. I mean, no one told them to pallete swap so much, and they could have gotten other costumes. Every MK characters has their little own evolution going, but I think Reptile's took the turn for the worst.
Peace.

they should of kept the ninja costume in MK4.(it was an alternate btw) considering that he is a reptile hence his name his appearance makes sense.

I like Reptile's evolution.

Reptile isn't evolving.. He's de-evolving. He could disguise himself as a human for only so long, and abscense from Zaterra is making him return to his natural form.

Reppy's ninja costume was a good idea only for the reason that he had to disguise himself using it so that he could fit with the other fighters in MKII. He doesn't need it anymore and couldn't even wear it anymore if he wanted to anyway,with his current form.

Well if one of the endings of MKD was any indication onagas power has RE-Evolved him. and im happy. i love reptile no matter what form he's in as im sure u can tell by my icon and sig pic. But over all i DID like ninja the best. the newer version of him in MKSM i think is my favorite so far. Lime green with a tattered black thing for a mask in a more classic looking tunic. I always wanted to know why he wore the muzzle thingy in MK4.