Mahou no Stage Fancy Lala

These two shows are very similar. Both are about a young girl pursuing her dream of becoming a singer and doing it by transforming her body into an older version. The main difference is that Fancy Lala is very lighthearted compaired to Full Moon. In Full Moon wo Sagashite the plot is much more complex and deals with fighting against death and other things, while Fancy Lala just talks about becoming a singer. I'm not saying that Full Moon is depressing... it's incredibly interesting and if you can survive the filler episodes you'll find an awesome anime. Fancy Lala is the typical "little girl's dream of becoming a singer", while Full Moon is inspiring... it's about never giving up on your dreams or your life. read more 

They are both girls who transform into an adult. 

Both series have similar concepts- they both involve a girl who makes herself older to become a singer. They both also have cute 'mascots' that cheer them on, and both involve the girl becoming a model(at some point.) Of course, there's a lot of differences between the two, but I'm nearly 100% positive that anyone who likes Fancy Lala will also like Full Moon, or vice versa. :) 

When you watch this series you'll notice a lot of similarities besides they are of the Mahou Shoujo genre, in fact I have the idea the author of Full Moon based his own series in Fancy Lala the differences may be in the lenght of series that has more episodes to be told in Full Moon allowing more in depth development, and in Fancy Lala the story isn't ominous like Full Moon wo Sagashite with Mitsuki. Similarities are the protagonists thansform in a teenage version of themselves, they get their magic transformation from a pair of magical mascots, and both become famous and popular idols. 

it's about a young girl that transforms herself into her older self and becomes a successful idol while dealing with hiding her identity from others with the help of two companions that are usually in stuffed animal form. The plot and feel of the shows are very similar. Full Moon wo Sagashite has more romance and other topics like the possibility death involved, while fancy lala is more about the job. 

Both mahou shoujo anime where the protagonist is a little girl who can transform into a pretty, popular singer/idol. The girl also has two magical creatures that follow her everywhere. In both Creamy & Fancy Lala the idol has a female rival who hates and envy her. Last but not least, for both anime the original illustrations and character designs are by Akemi Takada. 

Mahou Shoujo episodic and fun with both anime that have a protagonist who makes magic from drawings. Pastel Yumi is more relaxed, Fancy Lala has more serious episodes and a beautiful message at the end. 

Both are Magical Girls by Studio Pierrot. Each series has a different theme - Emi's being Stage Magicians, Lala's being Manga and Singing - but each girl has the ability to become and older version of herself, and perform genuine magic to enhance their abilities, which must be kept secret from those around them. While their struggles are all different, the reason for them - keeping their magic secret, and wanting to be successful as themselves as well - are very much the same.