Further notes

Queen Leech was engineered as Dr. James Marcus' greatest achievement, and its biology differed radically from that of natural leeches. Like natural leeches, Queen Leech was a hermaphrodite, though unlike natural leeches it was capable of self-fertilisation. Queen Leech possessed a sophisticated olfactory organ which allowed it to communicate with offspring via smells. A damp or humid environment was required for Queen Leech to thrive, as with natural leeches, though direct sunlight had the added effect of inducing pain.[1] Queen Leech In keeping with other leeches experimented on,[2] the Queen Leech was known to cannibalise its offspring.[3] In a form of mimicry far beyond that of the leeches, Queen Leech was able to shape its whole body to mimic that of Dr. Marcus, becoming shorter and gaining arms and legs. As a personal choice, it took the form of Dr. Marcus' younger self, rather than the elderly figure that created it. This ability only surfaced after ten years of maturation,[3] it should be noted, and may not have been foreseen.

On a scale of intelligence, Queen Leech far surpassed that of annelids and may have been intended to rival that of human beings. After parasitising the corpse of Dr. Marcus in 1988, Queen Leech consumed his brain and proved itself sentient in gaining his memories and personality. As a result of this parasitism, Queen Leech rationalised that it was indeed Dr. Marcus and had somehow survived an assassination attempt.[4][excerpt 1]



  1. Excerpt from KAITAISHINSHO, p.082: "若き日のジェームス・マーカスの姿を模していた存在が擬態を解き、 本来の活動に適した形状へと変化したもの。 その正体はすべての変異ヒルの頂点に立つ女王ヒルであり、 ウィルス感染から10年以上が経過した個体であるためか、 身体組織の変容と発逹は想像を絶する域にまで逹している。 知能は極めて高く、 何らかの伝逹手段(微量の化学物質を含む嗅覚情報である可能性が高い)を用いて、 無数のヒルの群れを訓練された兵士のように指揮している模様。 その意志と思考は明らかに10年前に殺害されたマーカス博士のものであり、死亡直後の肉体に侵入した女王ヒルのもたらしたt-ウィルスが融合現象を誘発したと考えられる。 しかし、 これをヒルのDNAを獲得した人間ベースの生命体と捉えるよりはむしろ、 長い年月をかけて死者の遺伝子情報を取り込んだ女王ヒルがマーカス博士の人格をも転写したと見るのが妥当であろう。 余談だが、 ヒルは雌雄体の生物えあり、 ”女王” の呼称は群れの統率者として便官的につけられたものだ。"
  1. Resident Evil 0 (2002), cutscene: "Sunlight".
  2. Resident Evil 0 (2002), file: "Leech Growth Records".
  3. 3.0 3.1 Resident Evil 0 (2002), cutscene: "Revealed".
  4. Hamamura (ed.), KAITAISHINSHO, p.082.
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