You may be correct.
Yepyep, Lady Steel will be a big part of upcoming chapters and I love her a lot. You may be bang on the money with your assessment of her
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Yep, each of them will have their "getting to know you" moments... including Emerald.
Nowhere near as advanced as the danger room, but yes, there will be training.
All powers pretty much bang on except the duplication is not Marina... Cat is the duplicator. You'll find out what both Cat & Marina are about in Chapter 4.
And side note, Isabella will return in the future.
I mean, I'm not ruling anything out yet but there's a few I'd probably consider too OP. I won't name them though. Fun to keep people guessing what's coming (and what isn't).
Profiles is not found on the main menu. It's a tiny semi-transparent icon top right of the screen. It's not anything super in depth, literally name, alias (if any), age, power, a picture of them, a LI/side girl status icon and a link to a special render gallery (for some of them).