Pagachu

Pagachu is a Japanese Original Video Animation (OVA) series that was released from June 19, 2011 to September 20, 2012.

Characters
Pagachu is a naughty but cute mouse alien who lives with Chaniwa Rumina due to being banished from Planet Yaka to Earth after she, Yumi and Hiroku accidently broke a vase belonging to the Grand Yaka. She is the oldest sister to Yumi and Hiroku.

Chaniwa Rumina is a 10 year old girl living with her mother and sister. She is the only one who knows that Pagachu, Yumi and Hiroku are aliens but never really tells anyone about it since she knows that no one would believe her. She is in love with a boy named Kenichi and is constantly bullied by Einosuke and Makoto. Her favourite manga series is Chimpui.

Junko Rumina is a 59 year old woman who is the single mother of Chaniwa and Machiko.

Machiko Rumina is a 2 year old baby who is the younger sister of Chaniwa.

Yumi and Hiroku are both alien Mice who are the younger sisters of Pagachu. They were banished to Earth along with their older sister for accidently breaking a vase belonging to the Grand Yaka.

Eionsuke Toriyama is a 12 year old boy who attends the same School as Chaniwa. His way of bullying Chaniwa mostly involves sexual harrasment (ex. pulling up her skirt or slapping her butt). It is mostly implied that he bullies Chaniwa because he is secretly jealous of her being in love with Kenichi and that he secretly likes her.

Kenichi Yanase is a 11 year old boy who is the classmate of Chaniwa as well as her love interest. He is one of the smartest people in the class and always get straight A's (although he doesn't really like to be good at everything). He doesn't trust Pagachu, Yumi and Hiroku as he thinks that they are faking their banishment so they could capture Chaniwa and take her to planet Yaka so she would marry the Grand Yaka.

Cast
Junko Hori: Pagachu

Haco: Yumi

Rumiko Tezuka: Hiroku

Wasabi Mizuta: Junko Rumina

Reiko Okana: Machiko Rumina

Masako Nozawa: Kenichi Yanase

Gen Hoshino: Einosuke Toriyama

Megumi Hayashibara: Chaniwa Rumina

Yorie Terauchi: Makoto Tomita

Trivia

 * Pagachu, Hiroku and Yumi were originally going to be related to Chimpui (according to Gen Hoshino) but Junko Hori, Pagachu's actress, requested not to make them related to him in any way, shape or form since this would imply that Pagachu is a spin-off of Chimpui.