I can't speak with authority, of course, but it's so appropriate I have to wonder if it's a nickname!
[It's also the name he'd given Ken as a shinki. It will, at least, let him blend in with the older ones, so long as he doesn't give his surname as well.]
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[It's also the name he'd given Ken as a shinki. It will, at least, let him blend in with the older ones, so long as he doesn't give his surname as well.]