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An Alien plant that was given to Rito on his 17th Birthday as a present.
Lala's gift to Rito for his 17th birthday, was in the form of an absolutely giant plant from some random planet around the galaxy. Which was rather thoughtful of Lala when you think about it. Especially considering how air-headed she is, she still understood that Rito loves gardening.
Celine spends most of the manga as a prop in the background. Until Lala's twin sisters arrive. One of whom has a connection with plants and actually gives Celine her name. Shortly afterwards Celine becomes ill, and the whole gang goes on a cross galaxy trek to find an antidote. Where Rito actually gets the opportunity to be something of a hero for a while.
When they return with the antidote, Celine expels a seed that takes the form of the adorable little girl that is shown to the right. Thankfully, there are absolutely no ecchi moments involving the flower child. She is unable to speak, but as a plant that was cared for by Rito she loves him as only a plant could, with no lust whatsoever. She has a bizzare love of soda, which gets her drunk (only in a manga) and causes her to emit a pollen that makes everyone around her love Rito just as much as she does, men and women. She eventually hits Golden Darkness with this which possibly makes one of the cutest moments in the entire manga.