A guardian is one who protects and watches over others. While Iron Tail does do that as a 'Hero', I always think that Des, who has actually lost many people dear to her, would understand a lot more about the values of life and will be more protective of them. That, and given the magic she's capable of, it's fitting that she'd be called 'The Guardian'.
While she does look up to the younger Iron Tail for being everything she's ever wished herself to be (brave, confident), she still acts like a sister-figure and worries over his safety every now and then.
Des belongs to