I was able to unlock Nosferateen by downloading an older version of the game and unlocking him there (play five on a couch games) before downloading the newest version. SO either he is glitched or his unlock has been altered in a later version. Here is a link to how to downgrade steam games and SteamDB: https://www.makeuseof.com/how-to-downgrade-steam-games/ https://steamdb.info/ You want to choose the second to last listed manifest (this is the first version with Nosferateen). Downgrade, unlokc him, then ...

How do you unlock him/her?

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Welcome to the Oh...Sir! The Hollywood Roast Workshop Manual, where you can find basic information, and resources that will help you prepare your own character modifications. The Hollywood Roast supports modifications to Character Graphics and Character

I have a theory that in order to unlock him (or groan if he's the one who's locked) is to play against someone online who already has him. It's a long shot but I'm desperate to try.