Lady Timpani is a main character of Super Paper Mario, along with Blumiere. This photo is a theory of what she looks like as a human.
Lady Timpani was a member of the tribe of Ancients. One day, she met Blumiere, a member of the tribe of darkness and saved him because he fell of a cliff. Soon after, the two fell in love. The two planned to run away and get married, but Blumiere's father learned of their secret and caused Timpani to wander through dimensions until she died. Eventually, she ended up in Flipside, and got saved by Merlon and turned into a Pixl by the name of Tippi.