Drawings of Exposed Bellies - Vulnerable Yet Beautiful

Whether a character is wearing a crop top, stretching, or a gust of wind lifts up their shirt, seeing their exposed abdomen makes them seem cute and a tad vulnerable. The append module that featured the new outfits for the Kagamine twins (from Vocaloid) pictured below embodies this vibe pretty well.

What do you think of the other character designs in this compilation?