There's some circumstantial evidence that says Mitron was originally female. In addition to their true name being Artemis, there is also the fact that someone tied the voices from the crystals to their speaker and the Mitron voice was female in tone.
Combine that with Loghrif not recognizing Mitron during their reunion and you could make the case that Mitron has always been the old girlfriend, if you so choose
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Bart, with $10,000, we'd be millionaires! We could buy all kinds of useful things like...love! ~Homer J. Simpson