Man, Diane from 'The Seven Deadly Sins'? She's a fascinating case study in how a 'strong' character can be written, and honestly, my feelings about her role have shifted a lot. Initially, she's the literal giantess, the Serpent's Sin of Envy, and her physical power is off the charts. But her function in the narrative goes way deeper than just being the muscle. Her arc is heavily tied to memory and identity—she's lost hers, and watching her rebuild her sense of self, her relationship with King, and her place in the world is the emotional core of her story for a long stretch.
What really gets me is how her envy isn't some petty thing; it's born from this deep-seated loneliness and a desire to belong. She feels like an outsider because of her size and her race, and that informs every interaction. She plays the protector often, but she's also the one who needs protecting emotionally, which creates a great dynamic with the more fragile-seeming but fiercely loyal King. Without giving too much away, her role evolves from a lost powerhouse to a pillar of the group, a guardian of the next generation, and someone who finally finds a family. That journey from a place of lack to a place of wholeness is her real contribution.
I've seen some fans criticize her for being too defined by her love interest, but I think that misses the point. Her relationship with King isn't her sole purpose; it's the catalyst that helps her reclaim her past and solidify her future. She's the heart of the team's grounded strength, the one who often brings a raw, emotional perspective when everyone else is caught up in grand prophecies or battles.