In the mobile game there is an picture for the 'arena store'. What is interesting is that it shows gear for various characters and also 2 capes. One is clearly black adam's, but the other one does not look like one that a current character has... so is it Martian Manhunter's? If it is, it would suggest he is a DLC, most likely the one that was seen on the bottom right of the character select screen. I'll let you decide.
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