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Thanks to @AquamanShrine, I checked out IGN's The Top 25 Heroes of DC Comics article by Jesse Schedeen. I was happy for the Manhunter from Mars to come in at #13, ahead of Green Lantern Kyle Rayner, something you would not have seen in the JLA heyday. While both heroes have been shuffled off center stage, J'Onn J'Onzz hasn't had his own book since 2001, while Kyle hasn't been without a starring vehicle since 2007. Was this list at all objective for me to give any weight to the preference for the Alien Atlas? It also featured the art of Eddie Nunez seen above, which appears to be required by obscure federal law for at least 46% of all Martian Manhunter-related posts on the internet.
Speaking of percentages, it's possible the Sleuth from Outer Space benefited from being an "original" character. 40% of the list is made up of conceptual variants, meaning characters who are legacies that are immediately derivative of a prior character. Mantle-bearers, corpsmen, "girl" versions of male heroes, etc. Most ranked after the Martian Manhunter though, so his placement on the list isn't majorly effected. Ahead of J'Onzz were, in ascending order, Swamp Thing, Green Arrow, Aquaman, Shazam, and the usual suspects from there. I can live with that kind of company.