[That's a really tough question, actually. Does it matter if his other self had been human once? How would he have taken such a change?
[... Then again, he's turning into one now, and a couple of uncomfortable memories aside, it's not so bad. If his other hadn't always been so, had he felt the same about changing? What else does it entail, anyway? He hasn't had any physical changes, doesn't expect any at this point. All the memories he does have suggest a fully human appearance. And that uniform he got as an Echo mostly fits him, even if it's a bit small. So that supports the looking human thing, too.
[Having military rank . . . that implies there had been training, but could humans turn into something else just from that? Maybe he had always been one, and the training just refined it. That seems less drastic. But is it better? He . . . really has no answer for that.]
[It's a long time before any answer comes, an indication that he's been giving this matter some very serious thought.] I don't know if I would or not.
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[... Then again, he's turning into one now, and a couple of uncomfortable memories aside, it's not so bad. If his other hadn't always been so, had he felt the same about changing? What else does it entail, anyway? He hasn't had any physical changes, doesn't expect any at this point. All the memories he does have suggest a fully human appearance. And that uniform he got as an Echo mostly fits him, even if it's a bit small. So that supports the looking human thing, too.
[Having military rank . . . that implies there had been training, but could humans turn into something else just from that? Maybe he had always been one, and the training just refined it. That seems less drastic. But is it better? He . . . really has no answer for that.]
[It's a long time before any answer comes, an indication that he's been giving this matter some very serious thought.] I don't know if I would or not.