marshmallow

A light, spongy, very sweet confection made of corn syrup, gelatin, sugar, and often vanilla.

A confection of sweetened paste, formerly made from the root of the marshmallow plant.

A perennial plant (Althaea officinalis) in the mallow family, native to Eurasia and naturalized in eastern North America, having pink flowers and a mucilaginous root used in herbal medicine and formerly in confections.

Someone who is soft and benign.