Additionally, he has no family, is unmarried... is an only child, and both parents are deceased... making him an ideal candidate, with no one to ask any nosy questions... should something go wrong with the experiment.
そして彼は家族もなく未婚 一人っ子であり 両親は既に死亡している 余計な詮索をしない性格も 理想的な要素と言えます