A very fun read.
Just a couple of little things that are bothering me (they may have been already answered a 100 times, but still):
Heythere! Glad to see someone new to the story! I spotted some things in your post that I thought I could help you with, so here goes:
1) AU of making Shards powers "magic" when they are canonically "so nonmagic that Entities can't even perceive the idea of the reality of magic which bars them from traveling to the magic parts of the multiverse". But it's an understandable AU - otherwise all magic powers would be actually useful just due to their inscrutableness, instead of appearing as crafting multipliers and nerfed curiosities. On the other hand, it shatters the main motivation behind Entities actions, without AU change they were driven by the need to escape a certain death due to limitations of the physical reality which is not the case when magic is taken into account.
I think this one is more explained that the CELESTIAL FORGE treats Shard powers as "magic" for purposes of shard-Forge interactions is all. Nothign about the Shards themselves has changed.
{Pre-Post Edit: Yeah,
@MagicalAmbitions has this right.}
2) MC's fixation on tackling everything head on. If he wasn't so fixated on defending against March strikes he would've realized that dodging and redirecting it is a lot better alternative - because her power requires a material medium, and also because even if given all the perfect timing in the world, most parahumans are not much faster than regular humans, all while MC is. Yes, it wouldn't have helped with Oni Lee's surrounding tactic, but... By that time MC had teleportation technologies - at least Transformers one, which wasn't even mentioned in any way. Also he didn't even for a second thought about any way to disrupt, negate or dissipate the effect.
Really, nothing ever was said about how he planned to oppose the thing, just his fear of it.
And what had happened with his scans of the Striker effect right before the explosions? IIRC he was sending live telemetry and with his suite of sensors he should've gotten something out of it.
This ties partly into Joe's neurotic family life, and how his low self-esteem issues are hamstringing him. It's part of what makes him so interesting as a character, he's got a form of Imposter Syndrome, where he -believes- he can't meaningfully affect things, so he doesn't plan to do so, but when forced into a situation where he -has- to act, he pulls it off brilliantly, and he's left afterwards thinking that he couldn't really have done all that, or that it wasn't as awesome as we know it to be, and everyone else seems to think it is. ^^ He's not just modest, but honestly thinks, deep down where he hasn't examined it yet, that he -can't- do anything other than screw up. His family have basically conditioned him to believe that. That's why he's going to therapy (and still dreading it).
3) Strike Witches stuff is super-arbitrary. It's like everything transformative MC can do with all of his other equipment (not the "upgrade everything to adamantium\mythril" part) he can't do to the strike craft tech for some dubious entertainment value, not for real reasons. Example? If pants can't be worn inside, then they can be placed on top - nothing so far had said they can't. The same goes to the familiar traits - he should be able to easily hide them using his hard light, holographic and illusion projection tech.
Yes, the Strike Witches crap is very arbitrary. I'm wondering myself why he hasn't thought of the idea of "pants on the outside, boots on the inside", but that's probably just because he's stuck with Garment for fashion advice, and -she- very much likes the idea of ultratight pants. ^^
4) On the question of hiding... When he wants to hide his changes, especially forced stylistic effects, shouldn't his Efficiency power make him the most efficient at hiding these changes from the normal people? Efficiency in this field will also mean the least attention required for maintaining it.
He's mentioned as being able to control those things due to Efficiency yes, but they're still Fiat-Backed, so they can be minimized, but not eliminated, and they take conscious control to minimize, so Joe can only do so much at a time.
5) MC's criminal under-utilization of the Super Science Household power.
Peeping on your neighbors is a household activity. Boom - Mad Science spy system capable of covering the whole BB right from his home because all of its citizens can be tentatively designated as "neighbors"; maybe even Shards can be included into "neighbors" category because they are, only in a different space.
I'm not certain one way or the other about this one, so I shall defer to others' opinions.
Knowing weather forecast is a household characteristic - boom, Mad Science weather station capable of predicting weather with 100% accuracy; no more "maybe I-Field will dissipate due to rain, or maybe not" musings.
That actually sounds plausible, and god would I love to have that. >.> Where I live, the weather is notoriously unpredictable, especially in the spring.
Connecting to and expanding your WiFi is a household task - boom, a Mad Science signal repeater with untraceable connection from his Workshop
He actually did this one, that's how he made that untracable call to Weld, even with Dragon attempting to backtrace his cellphone.
Dimension to the Mad Science router in his rented flat; it'll allow him to close The Door and still remain connected.
I think this one was included in the former one, either way he somehow called Weld from inside his Workshop, though I don't know if the door was -closed- or not.
Cleaning dust is a household activity - boom, a device to clean the Dust from any area.
Remember: Washu tech tends to be into rather spectacular self-disassembly events if you use it for things outside its scope. I'd think he'd rather not try to hoover up the Dust with something that doubles as a pee-wee sized nuclear bomb if you misuse it.
Watching news is a household activity; boom - a Mad Science TV that can inform you about anything "newsworthy" in the world, in the country and in your local area using a tech-based omniscience (a planned gathering of Supervillains is certainly newsworthy even if no actual news company will ever know of it; arrival of the Coastal Shields tinker, or one of the most destructive Villains in your town are also newsworthy; coming of the Golden Man itself is definitely a newsworthy event).
I actutally think this could work, but I would have a feeling that it would only be usable 'in the home'. on the other hand, Survey would be GLUED to the fucking thing. ^^
Thank you for your interest, and I hope I've been informative. ^^