And I thought anime like Pokemon were formulaic, one-dimensional shows.
Bottle Fairy takes the cake in that category. Shows such as Doraemon and Sazae-san are acceptable for all ages in Japan, but are watched by people of all ages all across Japan. Bottle Fairy may be a harmless show like Doraemon, but I can not see any person above the age of five enjoying this show. Even then, the slow pace of the series will turn off a lot of those kids who can divert their short attention spans toward Pokemon.
None of the characters are described at all. Everyone is one-dimensional. The four miniature fairies: Hororo, Chihiri, Kururu, and Sarara all have the same exact personality. They're really, really, really cute fairies that do really, really, really cute things. That's pretty much all they do. The one called "Sensei" is not much of a teacher at all. He has about two lines of dialogue to speak per episode that are completely and utterly meaningless to the plot. Though I can give him some credit. During the last two episodes, he actually says lines that are not, "I'm leaving" or "I'm home" or something similar to that. Tama gets more lines to speak, but more dialogue doesn't mean more personality. Her job is to (mis)guide the fairies on their quest to become human in each episode. She doesn't intentionally misguide them. She's just a clueless grade school kid who has nothing to do but to talk to pint-sized fairies every episode.
Normally the episodes center around a particular holiday or date in which they learn about certain Japanese customs and traditions that humans are very used to. They are led by Tama to learn about all these things: most of the time. Sometimes they don't even learn about humans in the series. Practically an entire episode was dedicated to having all four cutesy fairies presenting random poetry that has the sole purpose of rotting the teeth of its viewers with large doses of "cute".