GuessAnime.

6. Love Hina

Keitaro Urashima promised a girl when he was young that they would meet up again at Tokyo University in the future. Sadly, in the National Practice Exam, Keitaro ranked 27th from the bottom. Knowing his grandmother owned a hotel, Keitaro intended to stay there while continuing his studies for Tokyo U, only to find out the hotel had long been transformed into an all-girls dormitory. Through an odd twist of fate, Keitaro eventually became the manager of the dorm, beginning his life of living with 5 other girls.

Love Hina is finished and has 24 Episodes. It is also Known as: ラブひな, Love Hina

5. Itsudatte My Santa!

Mai, a Santa in training, appears in front of an unlucky boy named Santa on Christmas Eve, promising him that she will make him happy for one night.

Itsudatte My Santa! is finished and has 2 Episodes. It is also Known as: いつだってMyサンタ！, Watashi no Santa, Always My Santa

4. Kyouran Kazoku Nikki

Midarezaki Ouka is used to having strange things happen to him -after all, he is the head of the Great Japanese Empire Paranormal Phenomena Bureau of Measures. But when he catches a small cat girl in the shopping district stealing apples, his whole life rearranges to fit a new operation...

OPERATION COZY FAMILY.

Thousands of years ago, Enka the God of Destruction, was killed. However, with a dying breath it claimed that its child would appear and destroy humanity. Now in futuristic Japan, all of the potential children of Enka have been found and placed into a haphazard family.

Teika the lion, Gekka the jellyfish, Yuuka the oni, Ginka the cross-dressing mafia son, and Hyouka the bioweapon--along with their parents Ouka and Kyouka --all live under one roof in a family frenzy.

Kyouran Kazoku Nikki is finished and has 26 Episodes. It is also Known as: 狂乱家族日記, The Diary of a Crazed Family

3. The Melancholy of Haruhi Suzumiya

Kyon, your typical high school student, has long given up his belief in the supernatural. However, upon meeting Haruhi Suzumiya, he quickly finds out that it is the supernatural that she is interested in—aliens, time travelers, and espers among other things. When Haruhi laments about the lack of intriguing clubs around school, Kyon inspires Haruhi to form her own club. As a result, the SOS Brigade is formed, a club which specializes in all that is the supernatural.

Much to his chagrin, Kyon, along with the silent bookworm, Yuki Nagato, the shy and timid Mikuru Asahina, and the perpetually smiling Itsuki Koizumi, are recruited as members. The story follows the crazy adventures that these four endure under their whimsical leader, Haruhi. The story is based on the light novels by Nagaru Tanigawa.

The Melancholy of Haruhi Suzumiya is finished and has 14 Episodes. It is also Known as: Suzumiya Haruhi no Yuuutsu, 涼宮ハルヒの憂鬱, Suzumiya Haruhi no Yuuutsu

2. Sister Princess

Wataru Minakami is a top student who failed his high school entrance exam because of a computer glitch. He later discovered that he was accepted to Stargazer Hill Academy, which is located at a mysterious place called Promised Island. At the request of his father, Wataru is whisked away to the island, and before he can settle in, a dozen of cute and charming girls start to flock him and claim to be his younger sisters. As Wataru gets closer to his newfound siblings, a deeper mystery as to why they were sent to the island comes to play.

Sister Princess is finished and has 26 Episodes. It is also Known as: シスター・プリンセス, SP, sispri

1. Onegai☆Teacher

Kusanagi Kei, a high-school student living with his aunt and uncle, has an encounter with a female alien. This alien is revealed to be a new teacher at his school. Later, he is forced to marry this alien to preserve her secrets. From there, various romantically-inclined problems crop up repeatedly.

Please Teacher! is finished and has 12 Episodes. It is also Known as: おねがい☆ティーチャー, Onegai Sensei