Fuu

In the anime, she is Kakuka's companion who tries her best to keep Kakuka out of trouble, often cleaning up the messes she makes from her nosebleed episodes. She's a good ventriloquist, usually utilizing it on her head ornament she named Houkei. She is also seeking to serve under Sousou as a strategist, and is accepted as such.

In the visual novel, she is the silent adviser girl and a new character in the sequel, Shin Koihime Musou. She is most notable for always carrying a lollipop, as well as wearing a head ornament that somehow reflects her emotions.

(Source: Wikipedia)