She is a height challenged pirate famous across the universe for her deeds and at the same time mother to a confused young man back on planet earth who doesn't even know the truth about her mysterious origins. 

Mito, a three-foot tall alien, is known as a wanted criminal and the galaxy's most dangerous pirate. But all she really wants is to be called "Mom." Aoi, her earthbound son, has no idea about his mother's infamous career. Aoi's in for an adventure that brings him to all corners of the universe, with the first working mom to carry a pulse rifle! 
 
(Source: Media Blasters)

Tomoko Kawakami was a Japanese voice actress. Having graduated from the Toho Gakuen College of Drama and Music, she was affiliated with Production Baobab at the time of her death.

In August 2008, Kawakami was diagnosed with ovarian cancer, which required surgery. During a three-year battle with cancer, most of her ongoing roles were replaced by other voice actresses, although the latter was able to do some voice work until her retirement in the start of the 2010s decade. She died on June 9, 2011 at the age of 41.

The second season of Uchuu Kaizoku Mito no Daibouken. 
 
Aoi was raised as a normal boy on Earth. Little did he know he was the heir apparent to Mito, the Queen-turned-Space-Pirate of an alien race that chooses their sex at puberty! Aoi fell in love with Mutsuki, the police officer who was chasing Mito, and the three of them saved the Universe. The only side effect was that Aoi blossomed into a beautiful young woman. 
 
Now a malevolent entity calling herself the true Queen of the Universe appears with enough power to destroy entire planets. Aoi must defend her new throne, but she needs Mutsuki's help. Mutsuki must come to terms with her own feelings for Aoi so they can defend Earth together and become the galaxy's first royal pair of queens. 
 
(Source: Media Blasters)

Mito Mitsukuni