The magical My Melody used to live a normal life in Mari Land, picking flowers and baking cookies for her friends and family - that is, until Kuromi and Baku escaped from the royal castle and fled to the human world! They took with them two magical treasures - the melody bow and the melody key - which, when used for evil purposes, can grant the user the ultimate Dark Power. Now, My Melody must travel to the human world to put a stop to Kurumi's evil plans to turn one hundred human dreams into nightmares. By her side is Uta, a human girl who is in love with the violin genius Hiiragi - a talented boy who unfortunately has decided to assist Kuromi in her devious plans...
One clear festive evening, Lucia, a mermaid princess, rescues a young boy from drowning. With him, she leaves the source of her beautiful singing voice: a pink pearl necklace. Several years later, Lucia has grown into a young woman, and embarks on a quest to the human world to reclaim her pearl and find her lost love.
Shoujo? Check! Excessive girlyness? Check! If you are looking for magical girl goodness aimed at the same age range and with an incredibly similar feel, look no further than Onegai no Melody and Mermaid Melody. Extremely similar in almost every way.
Hinamori Amu is a stylish punk rock girl who is liked and feared by her peers, but there's just one problem: she's actually a shy and quiet girl who can't seem to drop her self-fabricated facade! But when Amu finds three eggs in her bed, she had no idea her life would change forever. Out of the eggs pop Ran, Miki and Su, Amu's Guardian Charas; these being represent parts of Amu that she wishes she could be, even allowing Amu to transform into those parts at will! Now, with pressure from the other Guardians (including her crush, Hotori) to join their midst, dark sides of the psyche known as X Eggs to seal, and nefarious forces after a wish-granting egg known as the embryo, Amu's life has officially become more complicated!
Both series are about a realistic, young girl who has an adorable, unrealistic creature that makes magic happen. Their main opposition is an attractive older guy who is aided by adorably wicked counterparts.