Nikki puts me in mind of Typhoid Mary, from Marvel, and Rose & the Thorn from DC.
Adam seems to be a combination of Ras' A Ghul, Vandal Savage, and Apocalypse.
One thing I want to know, does Angela Petrelli have a power?
There is also Echo, from Marvel Comics. She has photographic reflexes, just like the Taskmaster.good eye Delvo. I think I almost notice that but got distracted, now that you mention it. . .
while on the comics topic. Copycat has the same power as the Marvel Villian Task Master. You know, it's really tough to come up with a completely original super hero these days.
As long as they don't infringe on the trademarks and copywrites of Marvel, DC and other, they can do pretty much what they want. Actually, I could see George RR Martin sueing the creators of Heroes before the comic book companies, he did create the Wildcards Universe, after all, and Heroes is quite abit like Martin's idea, also.Outright thievery
Check out Rising Stars a comic that had many heroes and a story about their live in a real world.
Heroes has taking more from that comic than X-men.
For example Nikkie is copied completely from one of the characters in that comic.
I don't think its only one comic they stolen ideas but from many comics cause people like Loeb has worked on and know alot of the people that wrote the comics they have stolen.
Stolen i say cause most comics like Heroes about superheroes in a real world try to come up with new ideas cause they cant steal from people in the same bizz. The creators of this tv show prolly gave money for the ideas. For example Marvel would get angry for using some of their characters. Like Monica being a total copy of Marvel"s Echo character.