In this sentence:
Does the particle に work in the same way as として? Is it the same as 私の退屈を埋めるための欠片の１つとして ?
Thanks for the answer!
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Yes, に works like English "as", a role marker. "You were chosen as one of the pieces...".
Is it the same as 私の退屈を埋めるための欠片の１つとして?
Yes, at least in your case, に is interchangeable with として. (Of course this is not always true because both として and に have many other functions.)