She is three times larger than the average Amanto from Planet Gorilla.
Due to deteriorated diplomatic ties with Earth, marriage between Commander Kondou Isao and the princess was planned in order to improve the diplomatic relationship between the planets. During the wedding ceremony, which requires the consummation of the marriage on the spot, Shimura Tae gatecrashed the party to presumably rescue the minors, namely Shimura Shinpachi and Kagura from having to watch such an act. The marriage ceremony was interrupted and the marriage was not made official.
In Lesson 670, Bubbles ended up marrying Kondou and she had a baby gorilla as well.