|Tsukasa, Konata, Kagami, and Miyuki.|
How Lucky Star is different, these girl are very random I mean random; there conversations will have you going wtf. Also Lucky Star has quite of references to anime, manga, and video games. The main anime they reference is "The Melancholy of Haruhi Suzumiya". Some of the random conversations are; how you eat your food, why isn't real life like video games or anime, why does your hair dry out after swimming and etc... now that i said what most of the anime is about ill explain each characters personality.
Tsukasa: younger twin sister of Kagami; she is a airhead, shy, sweet, loves to cook and sow, doesn't study well.
Konata: shortest of the group and hates it. Konata is a lot like me; she loves gaming, reading manga, watching anime, loves anime conventions. Konata is very lazy and crams for exams in a night, and loves copying work from Kagami.
Kagami: elder twin sister of Tsukasa; shes is the opposite Tsukasa. Kagami works hard, gets good grades, argues with Konata, likes games but more of a shooter genre, Konata is more of RPG and Sim dates gamer. Kagami doesn't like manga and Konata doesn't understand how she doesn't fall asleep while reading without pictures.
Miyuki: is the smartest and most adult looking. Miyuki knows pretty much everything all of them call her for all the answers, she is also very clumsy, forgetful when she concentrates on other things, and has that girl with glasses thing going for her. Konata always calling her molle(probably didn't spell it right.) Which means cute by your faults.
This anime has quite a few other characters like parents and family of the main characters, even teachers; but I felt the main characters are more important to explain. If you love Azumanga Diaoh i definitely suggest this anime.