Sparklestar is a character that appears in Kuu Kuu Harajuku.
Sparklestar was initially thought of as an asteroid that heading towards Harajuku. HJ5 accidentally get sent to space in the rocket that is supposed to blow it up. When it notices the girls, it becomes aggravated and life-like. Love mentions it is some sort of space creature.
Using the translator, the girls are able to communicate with Sparklestar and find out that it's fire went out and now it can't control what direction it is going. They feed the explosives to Sparklestar in order to reignite it's fire. Sparklestar thanks the girls and admits it will miss them. When asked where it will go next, it's mentions going towards the Proximus galaxy in order to eat a devil sun.