Character Description (From the Regretevator WIKI):

DrRETRO is a friendly, happy NPC who takes her job as a doctor seriously, often concerning herself with the health of others. This can be seen in her interactions with characters like Infected and PartyNoob. Despite this, she doesn't hesitate to kill players who annoy her, as well as random NPCs if the elevator happens to be too full.

She / They

Voice Description: 

Despite DrRETRO speaking only in cat noises in-game, we are looking for someone who can supply her with a voice!! You don't need to only speak in meows to be able to voice them, if you'd like to speak normally that works as well. I imagine DrRETRO's voice to be soft, caring, and somewhat professional, as she is a doctor.

https://regretevator.fandom.com/wiki/DrRETRO

Lines are from DrRETRO's canon dialogue in Regretevator.