Uno, the original Aztek, had a whole solo run and appearances in JLA and was a major factor in that story! Heck! He even made some cameo appearances in the JLU animated show. Reading the Morrison’s Aztek run, one is introduced to the plethora of powers Aztek and his battlesuit posses. Plus it was neat seeing a hero starting off locally and go through his trials to join the JLA. DC left cliffhangers but ended up just killing him off.
And although DC has reincarnated the character with Nayeli Constant under the mantle… they used her more as a side character with little substance. Her only backstory at the moment is that she was a software engineer from Austin. She too is part of the JLA but feels more like a tag along rather than earning it, especially with her role much more diminished.
DC should revisit the character and build her up more! Give Nayeli a more grounded origin. What problems did she face before the helm? Her friends and family dynamic. Bring in social issues. Aztek would also be a great way to introduce another pantheon. There is already a well established Norse, Egyptian and Ancient Greek pantheons in the DCU, adding an Aztec Pantheon would cover the western hemisphere’s ancient civilizations. Aztecs would make sense, with there enormous cities and pyramids! The potential for a great character is there IMO. DC definitely should revisit.