BMO. ... Despite being voiced by a female voice actress (Niki Yang, who considers BMO as male) BMO has no definite gender, and characters (including BMO) refer to BMO in a variety of ways throughout the show, including using both male and female pronouns, as well as terms such as "m'lady" or "little living boy".

Is BMO a girl or a boy Reddit?

BMO is confirmed as genderless, him ("him" just being a point of address") being a computer and all.

Is BMO androgynous?

BMO appears androgynous, and is labeled genderless by the Adventure Time creators. BMO has been referred to using both male and female pronouns by other characters throughout the series.