Holy shiiiiiiit he's going to be a magical girl!!!!!!!

Do I have a time limit for this choice?

No response.

Does all that magic react at all to the question? Or to anything? What is it, can he discern any more details, where does the connection to the something elsewhere lead—

Elsewhere. It's not exactly tied by a line of magic that travels linearly; there's magic here and magic there and it's connected, that's all. None of it reacts to the question.

And he can't see it and anyway he'll likely have a better shot at understanding it if it's in him—

Yes, he thinks very loudly. Yes, I do!

And there is a surge of magic, filling him like an empty cup brimming over, perceptible to him somehow through something other than his metamagic sense, even as he can feel through that sense the magical package pouncing on him and attaching and performing all kinds of fiddly functions to fit around him better, and then the next thing to do is the most obvious thing in the world--

Kaede takes a step back, blinking, and barely notices he's in the kitchen again as he puts his right hand over his heart and points at nothing in particular with his left index and middle fingers.

"My powers of transformation shall touch the unjust heart!" he cries, with light tendrils emerging from his feet and twisting around his body. "With Justice as my muse, naught shall be left untouched by my mercy!" He points at various different things with his fingers, and a laser-like point of blue light follows his fingers. "For a future where none will needlessly suffer, the Exalted Transmutation Aegis has come to save the day!" The tendrils twist and twirl around him, suddenly replacing his outfit with a white bodysuit and longcoat, with several details in varying shades of gray and silver, runes and inscriptions not dissimilar to ones found inscribed on various Galatean artefacts glowing a faint blue, and a silver belt holding it all together. He lands in a crouch, looking into where the sky would be if it weren't for the ceiling.

...and he starts giggling.

"Nice."

...and ooh what's this, this sounds fun—" Mana Fountain!" And he's showered in green light and he laughs and laughs and laughs—" I can generate mana!"

"Awesome."

"Wow okay I need to sit," he says, and does, still giggling. He looks down at his outfit, running a hand along the fabric, touching the glowing spots and the belt. Badass and sexy! he sends. This is the awesomest thing!

Edie is delighted for him and sends this.

He gets up again and hugs her. We're gonna fix everything!!!

Yep.

He beams and pulls away—does he have any other spells—he doesn't—What counts as personal achievement?

Varies by person.

Of course it does. Well, I am going to get a ton of useful spells and save the world with them!

And, okay, what does his magical girlness look like, from the inside? Is it any different or easier to understand?

It looks like: a magical girlness, which is attached to him.

It might be easier to figure out what it was doing if its moving parts were moving more?

Good point. He casts it again, "Mana Fountain!" and...

That bit right there that just did a thing seems roughly analogous to a thing in the girls' that did a thing when they cast spells?

Hmmmm. And did anything get converted into the mana he got or did it just appear out of thin air?

Sort of hard to say? There was some stuff going on where the mana came from but it's hard to tell if it's converting-type stuff or spontaneous generation-type stuff.

Okay, now to transform back...

The magic deactivates very neatly. Only some parts of it move when it does this.

He reactivates, doing the whole dance and phrase again.