Chloe Mansfield is the former envoy of UW World Headquarters and the bureau director of the UW Department of Peacekeeping Operations.She later becomes commander of radical organization Maria's Womb.

Chloe is a slim young woman of average height with fair skin. She has big, light blue eyes, long, blonde hair reaching her waist in the style of a hime-cut, and large breasts with a blue emblem shaped as a heart with wings tattooed on her left breast. She wears a bluish-purple yukata.

and she has the largest breasts in the whole series.

(Source: World's End Harem Wiki)