You would type @persona add, get a prompt on what you want to call the persona, then what you want to appear as (tall, fat, male, etc), what you want to sound like with @voice, what @lp you want, perhaps the names of the disguises you want to use with it?, and then the @persona is set.
You can just use @persona [name] to swap into it with a simple 'You take up your 'blank' persona', making it less screen-filling than @marcos. Last you use @persona stop to revert to your normal state.
@disguise-name and @disguise-desc is still up to the player to skillcheck in and set themselves.