Final answer:
Without more specific details or the name of the play, we cannot accurately determine which character is described as the father of seven deceased children who seeks to blame others for his misfortunes.
Step-by-step explanation:
The character in question who is the father of the seven children who died shortly after birth and who is described as vindictive and bitter, seeking to blame someone for his misfortunes, is not clearly identified in the excerpts provided. To give a factual and accurate response, we would need more specific details about the play or literary work in question. None of the given texts conclusively point to a single character that fits the complete description of having lost seven children and seeking blame for misfortunes except for a potential correlation with themes discussed in the works of Sophocles and Euripides. It is difficult to attribute these characteristics to a particular character without more context. Please provide additional information or clarify the play being referred to for a more accurate answer.