Aria

You can change Aria's name in the Customize tab.

"Now that you have completed the configuration, you are ready to play Pulse of Pain."

"First let me introduce myself. I am Aria, your virtual companion. You can see me as your teacher, cheerleader, or in some modes, punisher. Just as I have done during the configuration, I will help you understand the modes and learn new songs. I will also try to encourage you. Be that through words, dancing to your music (She did a few dance moves before snapping back into her talk), or if you do well, other forms of motivation. But you'll have to discover that for yourself. (She winked and a smile spread across her face.)"

I hope that means what I think it means.

"My appearance can be customized in the Aria tab in settings. You will unlock more options as you play, so don't forget to check it occasionally." Her clothes and hair quickly changed multiple times showing just flashes of the different options."

Did her breast size change as well?

"Also don't forget to check out "True" mode if you are up for the challenge. Or check the site for the DLCs."

"Now let's make some music!"