Tone in such comics often shifts between sweet and dark. On the lighter side, there’s the playful comedy of seeing an adult trapped in a child’s body dealing with modern social rules, or the giddy experimentation of someone who knows future outcomes and mischievously nudges events. On the darker side, returning to a prior state can expose trauma, unresolved guilt, or the ethical mess of changing other people’s lives. The narrative question becomes less “can they undo things?” and more “should they?” and “what does erasing, altering, or replaying a life do to one’s sense of self?”