Re: EMP Reactions. Ororo Munroe (616) is sitting in the Observation Lounge on Deck 12. When it hits, she visibly lurches and goes pale. A moment later she gets up and hurries out towards the pool so she can use her powers to view the energy flows around them and confirm that they've just suffered two simultaneous EMPs. Once she's done that she'll start trying to get everyone's attention to get the message passed around. "That was an EMP, check all the machines and electronics. If you aren't sure what to do, congregate near the lifeboats." Not because she thinks they'll have to evacuate, just because it's a good place to congregate when they don't have the network running. Any telepaths around? She asks them to pass the message to everyone.
Shuri is of course with all the other engineers working on their projects. I don't know who's most likely to take charge around there but her first thought will be to head down to check on the engines etc.
Sam Wilson (616) is most likely with Misty and will primarily be concerned with her since her arm is suddenly not working. :o He'll also send Redwing to try to locate Kamala and Lillie.
Ianto Jones is in his room and way too reliant on tech. He'll very quickly start cutting power sources from all his computer stuff - not that it'll help much now, but it could prevent further damage at least. Once he realises no form of communication is working he'll grab his handgun, check his taser and find that's useless too, and head out to decide whether he should be going to the lifeboats or school to meet up with people. If Sue Storm is around he'll let her know what he's done already and is doing now.
Melissa Gold's acoustikinesis powers are unaffected by EMPs, not using any kind of electromagnetic energy in their functioning. It's the pool party today so she's on Deck 12 at the pool and she also has champagne robot, so if you need some champagne or sonic-based powers, she's your girl.
I'm not sure where my others (America, Aracely, Cassie, Elsa, Laura, Maya, Remy & TJ were - Laura and Remy will both notice something happened and Aracely will get hit by the telepathic response as everyone freaks out. Falke I'll dump in a different comment so I can put medical warnings on.)