Only "guaranteed" if the player is stubborn and unwilling to work with us.

We (the Judges) are trying to make things more-or-less balanced/fair and not overly complicated, hence the generation of these House Rules.
Gun Monkey can easily be fixed by removing the "Another Gun" alternate power and using that 1pp to get a Feature (being disarmed once removes Autofire extra; it takes two disarm attempts to completely disarm him of his guns).
I'm still not entirely sure this would apply to Mecha Musmue, since Metamorph isn't an Array power, it's a completely alternate character sheet/alternate "you." Then again, the questions of "so what happens when a foe takes your weapon in one form -- will she have the weapon in another form? Or not? And what if the stolen weapon has a different pp cost from the weapon of the new form she takes?" do arise, so it probably would be best to re-work those) D. Shaffer
does need to give us stats for Mecha Musume's non-armored, Normal Identity form, though. And her Morph/Metamorph powerset may need to be reworked a bit, too -- there's a character in
Paragons that sorta does what she does and it might be good to look at how they stat up those changes (
think they did it cheaper there than what she's got here).
I (personally) don't see how Sierra losing her two Devices would "totally rip apart" and "destroy" her, since neither Device was present in her original (150pp) build, and one was IIRC added in at the (somewhat off-handed) suggestion of another. You may find other requested changes to be deal-breakers... but this is not the thread for that, as I will in the very near future be starting a new thread specifically for assorted "who needs to be re-built and why" stuff (and I don't want Hero4Hire poking in and admonishing us to stay on-topic

).