Which character went MIA and you want to come back?

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We've seen a lot of characters die (mostly because of Sylar). But a few others have just disappeared from the story... Micah, Monica, Hana, all missing in action. So which missing character do you miss? Is there anyone you want to see returned to the show's storyline in Volume 4 (starting in January)? I adore Micah. Peter is my favorite character and has been from the beginning but Micah always ran a close second. I want Micah back. :(