Post-SI...? No one, not willingly. Reed, post-SI won't at all, mostly because look at him. He was completely there with Tony the entire way, but he's not being held accountable for any of it. REED made the Thor clone, yet Thor is putting all the blame on Tony. (*is borrowing friend's rant about Reed*)
Carol is looking like she and Simon are being Hank's support, so you know that will be zero help there.
Peter, on the other hand, possibly might be the only actual source of help. He seemed during SI to be softening toward Tony and even more so in IIM7. If you're keeping current with IIM, though, Pepper might be a good choice. She can hook up to Extremis. It'll be a lot of comic book hand waving all the same, but she could possibly do it (see latest IIM issue for why I think that)
Maya, while possibly helpful, I believe is out of the question. She sold Tony, for all intents and purposes, to the Mandarin, his greatest enemy. You just don't do that
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Carol is looking like she and Simon are being Hank's support, so you know that will be zero help there.
Peter, on the other hand, possibly might be the only actual source of help. He seemed during SI to be softening toward Tony and even more so in IIM7. If you're keeping current with IIM, though, Pepper might be a good choice. She can hook up to Extremis. It'll be a lot of comic book hand waving all the same, but she could possibly do it (see latest IIM issue for why I think that)
Maya, while possibly helpful, I believe is out of the question. She sold Tony, for all intents and purposes, to the Mandarin, his greatest enemy. You just don't do that