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"You better make me happy Kenzou, because hardship doesn't suit me"
- Eva Heinemann to Kenzou Tenma

Eva Heinemann is a major supporting character in Monster. The daughter of Director Heinemann, she was Tenma's fiancee preceding the events that took place at Eisler Memorial Hospital, after which she subsequently dumped Tenma. She initially acts as a minor antagonist, attempting to have Tenma arrested throughout the series after he rejects her attempts to reconcile their relationship, but she is changed after she meets Martin and falls in love with him, and after her life is nearly taken by Roberto on two occasions.