I tried imagining how this might work, including thinking about how the mirror works, and this got me to revise my probability that the mirror would respond well to Quirrell downward. Assuming Quirrelmort and that Harry’s Dark Side is a reflection of Voldemort’s feelings on death (which are big assumptions, but they seem likely to be correct), I don’t think Quirrell would be recognized by the mirror as someone who both wanted the stone but did not want to use it (Voldemort killed people to save himself from death, dark side is terribly afraid of death and is known for using whatever resources it can, etc). (The key question is whether oclumency works on the mirror, but given that canon Dumbledore placed this security mechanism himself, according to him, I think the defense professor would be as uncertain as we are about Oclumency’s efficacy.)
What following the idea “How to retrieve the stone?” did turn up, though, was a parallel to canon, with Harry’s dark side suggesting he “Use the boy.” The question is which boy (Neville is the main candidate sticking in my mind, but I’m not sure why; maybe because he’s the only boy in Harry’s camp that seems likely to wind up in such a situation who might not want to use the stone? Most obvious candidates (Draco, maybe Ron?) seem like they’d have motivation to use it.).
I tried imagining how this might work, including thinking about how the mirror works, and this got me to revise my probability that the mirror would respond well to Quirrell downward. Assuming Quirrelmort and that Harry’s Dark Side is a reflection of Voldemort’s feelings on death (which are big assumptions, but they seem likely to be correct), I don’t think Quirrell would be recognized by the mirror as someone who both wanted the stone but did not want to use it (Voldemort killed people to save himself from death, dark side is terribly afraid of death and is known for using whatever resources it can, etc). (The key question is whether oclumency works on the mirror, but given that canon Dumbledore placed this security mechanism himself, according to him, I think the defense professor would be as uncertain as we are about Oclumency’s efficacy.)
What following the idea “How to retrieve the stone?” did turn up, though, was a parallel to canon, with Harry’s dark side suggesting he “Use the boy.” The question is which boy (Neville is the main candidate sticking in my mind, but I’m not sure why; maybe because he’s the only boy in Harry’s camp that seems likely to wind up in such a situation who might not want to use the stone? Most obvious candidates (Draco, maybe Ron?) seem like they’d have motivation to use it.).