We already (briefly) discussed things, but I thought I'd fill this out anyway!
1.) Yes, yes, yes! Luke is a hybrid of human and arrancar. He describes himself as being "half dead," but that's really not the case; more that because of DNA tampering, he has a hollow parked right next to his human soul, which is following its instinct and attempting to consume him. This manifests itself physically as a literal void growing in his chest, though it is currently subdued with machinery made of spirit absorbing seki-seki rock.
2.) Yes. Depending on what it is, it will probably piss him off. XD
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1.) Yes, yes, yes! Luke is a hybrid of human and arrancar. He describes himself as being "half dead," but that's really not the case; more that because of DNA tampering, he has a hollow parked right next to his human soul, which is following its instinct and attempting to consume him. This manifests itself physically as a literal void growing in his chest, though it is currently subdued with machinery made of spirit absorbing seki-seki rock.
2.) Yes. Depending on what it is, it will probably piss him off. XD
3.) Yes!