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10. The Greed Lantern
This one I just included because it seems that DC got to the idea first. The Orange Lanterns of Avarice are pretty much exactly this concept, but with a different color scheme. The only difference between this concept and the one DC already has in place is that, instead of a bug-looking alien named Larfleeze being the comic relief of the Lantern Universe, it would be Hal Jordan, John Stewart, Kyle Raynor, and Guy Gardner all hissing and spitting and clawing at each other, and ordering collectible plates from late night infomercials.
9. Erma Frost
They don't even have to change Emma Frost. She can remain exactly as she is. All that needs to happen is she gets an invitation from her identical twin sister, who decided against villainy and in favor of an accounting job, a good work ethic, and prudent yet savvy investment strategies. Add a little thing between Erma and Wolverine, have Emma get mixed up with Erma all the time, and it's non-stop hilarity at Xavier's School for Gifted Youngsters. Maybe, maybe, as an Erma Bombeck shout-out, this Erma can pen humorous stories about herself and her family.
Source: io9