I've always been on the fence about Shugo Chara. I wish Amu was older, she doesn't seem like an elementary student and it is creepy for me that Ikuto that is I believe in 10th or 11th grade has the hots for a 5th grader. Shugo Chara is mainly filler episodes. If the fillers were not there though, the series would probably only be a 13 ep series. The fillers allows the audience to connect with the characters. However it is frustrating that every episode is basically the same format:
(Amu meets a child who has a dream, the child has doubts about the dream, Amu gives a brief pep talk and the child returns to normal by the end of the ep).
As far as the embryo goes, the ending is rather dissapointing
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Really that little kid Hikaru was the mastermind and he just wanted a pretty stone. Seriously you spend 100 episodes which the main theme of catching the embryo and then you find it is just some kid's egg who was a emotionally deprived youngster that was being treated as a adult by grandpa.
It was a dissapointment for me, the climax was like a bubbly burst. So much build up and then I just wasn't satisfied with how it turned out.
Also I am saddened by the lack of romance. At one point I should be cheering for a child getting into deep romances because she and her little guardians should enjoy childhood. At the same time the amount of love interests for Amu is a constant slap in the face. Yet nothing comes it. I don't know if I am happy or frustrated.
That said, if you got the time, it is a cute show. If you like Tokyo Mew Mew, Gakuen Alice, Kodocha, Sailor Moon or any of those kind of shows then this is good watch. Frustrating at times with the obvious slowness but still overall a fun amusing show