0 is emotionless

Giving up his emotions in his past life, he has no memories of it or the several thousand before.

But what he does have is his rules, his training, his status and his orders.

Only flawed things can't follow orders

0 is not flawed, 0 follows orders.

But orders are up to his master and people who can claim the title of 0's master are varied indeed.

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I know the title is similar to another book (Master of All, Jack of None by Mythran) on royal road, but I didn't know it was a book when thinking this up, I haven't read it and this book has no connection to it and is entirely original.