Alternative character interpretation - Doctor Who companions Peri, Mel, and Ace

The common consensus seems to be that Peri was a sympathetic butt-monkey to 6's harshness. Mel, by comparison, seems to be viewed as the plucky and loud designated scream queen. In contrast, here's how I view them, and their dynamics with the doctor. Peri, while no shrinking violet, didn't have the personality to match 6. Yes, at times she was abused, but she never stood up for herself all that much and never made a proper effort to put 6 in his place, leaving him somewhat unhanded and a loose cannon. Peri was a negative influence on 6. Mel, while certainly a screamer, had enough pluck and personality to bark at 6, but always in a friendly and loving way. Mel was 6's first time having a guarding, an actual morality pet. Not just an emotional load to carry around. (While she certainly shouldn't be considered at fault, Peri was a major factor in the death of 5/birth of 6). Because 6 and Mel were such a match for each other, when 6 became 7 there was little need for him to manipulate her. He was able to enjoy lighthearted (by comparison) adventures. It wasn't until 7 met the troubled and lost Ace that he saw that he needed to bring out some of his darker traits. (Certainly 7 losing his original companion didn't help matters). When 7 met Ace he already knew she was being used as a pawn, and responded appropriately. Thoughts?

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