**Context:** MC can't believe that his favorite character in the mobile game,
which he has been playing, is real. He is going to buy a new smartphone in a
smartphone shop, to replace his broken one and participate in a gacha event.
Then he saw a cosplayer inside the shop, which is really looked like her, and
he thought that's just a cosplayer working in the smartphone shop, which he
went in to buy a new phone

> **" もしかして、なりきってる残念な……じゃなくて本物のレイヤーか？"**

Much thanks if anyone can explain to me the meaning of this sentence, and some
grammar being used here o/

More context below:

> MC「ほ、ほんとにリリアさん？」
>
> Lilia「ちょうどマスターのスマホが壊れて、このままもうゲームをプレイしてくれないと思ったから……」(his favorite character
> in a mobile game (gacha?)
>
> まだ話してもいないのに壊れたスマホの事を知っているとはっ！ もしかして、なりきってる残念な……じゃなくて本物のレイヤーか？
>
> その時、リリア（仮）さんが『マスター、まだ信じてないの？』とつぶやくと……
>
> リリアの体が白く輝き、展示台の上にあるスマホの画面に吸い込まれたっ！
>
> MC「Ｏ・Ｍ・Ｇ！」
>
> 吸い込まれたスマホに近づき画面を覗き込むと、その中に表示されているリリアが俺に向かって手を振っていた。

My guess but not sure based on context "If she's not her then it's unfortunate
.... Then she's a cosplayer ?"
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question
meaning japanese-to-english conversations video-games
What does this mean in this context ? もしかして、なりきってる残念な……じゃなくて本物のレイヤーか？ (MC did not believe that his favorite character in a mobile game is real)
Here 残念な means not "unfortunate" but something like "disappointing",
"pathetic", "unsatisfactory", "poor" or "trying hard but useless". 残念な(人) in
this context refers to an embarrassing/pathetic person who is behaving like
Lilia.

> もしかして、なりきってる残念な(人)……じゃなくて本物のレイヤーか？  
>  Maybe she is not a (mere) pathetic person but a true (professional)
> cosplayer (behaving like Lilia)?

So MC initially thought she was just a strange person wearing a strange
costume in a smartphone shop. Then he changed his mind and started to think
she is a capable professional (because she spoke exactly like Lilia and even
knew his smartphone was broken).
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answer