Passo is a blob who's usually there. She is hard of hearing and uses implants; typically a mic implant, an audio cable, or a pickup coil depending on what he wants to listen to at any given time. Other than that, she's got a normal-sounding voice, more humanlike compared to other blobs which have a higher ranged falsetto-type voice. 

Because of this, she has made a salary in the field of voiceover. Passo is also a singer and musician who usually plays the cello and several types of bass instruments. He plays in her own band which can be heard here.