claire in season 1 regenerates, in season 2 she can reconstruct her body and use her blood to heal others like her, kind like in a video game, claire would be only usefull in healing the characters. Claire is more a defensive character because of her power and agility because of her talent of cheerleader, i wonder if claire is immortal too, just like adam, because their power’s are equal.

nathan as i have written constanly, the creator should give him too a power to control wind, it really is necesary that he need an attack hability that may allow him to defend himself, but nathan is much more a character with more agility. But he can fight right i mean his a former marine or am i wrong (hope he comes back, some comments and interviews say that he’ll come back, that fine for me) and west, well not very diferent to nathan, but is clear that nathan flies much more faster than west.

hiro has total control of his habilities now, in season 1 he could control it some times, but now he does, he can go to different times and teleport where he wants, remember he goes exactly the day his father dies and he even get to primatech at the 2×10 & 2×11 episode. Hiro is much more a character that develops agility, but attack too only when he weelds his katana (samurai sword), and a superior power.

nikki, the only new about her was a different personality, sadly their wasnt many story for her this season, but she controls her strenght at some times, speccially when shes controled by murray when she destroys the door, but sadly the side effect on the virus has taken her powers for the moment, i wonder if she could survived to explosion (Larter said she’ll have her role back as nikki). Nikki is more than a character with great attack.

matt, that read minds in season 1, in season 2 can now control peple’s minds to do his will, or even enter their minds, just like his father murray “nightmare man”. He poses great power, and attack (his weapon hand gun) and defence.

sylar didt show any of power in this season, but we know he can developt the stolen habilities, because of his power of seeing how the things work, maybe everyone says if he eats the brain, i think not, perhaps the brains are like open books to him when he posses them, seeing how the stolen ability works.

Micah has contol of his power as well, and monica is learning to use them.

maya has now control of her power thanks to her gabriel “sylar”.

mohender, whell, only his antibodies for the virus.

elle knows to control her ability, but she abuses of them a lot. bod has control of them (alquemy), the haitian (block others habilities and erase memories, maybe the haitian’s powers stops severe nerves of the brain, because the habilities work out because of the answers of the brain), and who know what is angela’s power, even kaito, arthur, devauxe, victoria (the members of the COMPANY).

Hope the heroes too in what will follow the story continue to stay alive and follow their quests and developt their habilities.