[@PlatinumSkink]
Honestly, even if Mariette's a bit gloomy, she seemed too cute to scare monsters. Besides, she has adorable monsters as her underlings, and they don't seem to serve out of fear. Big Brother also didn't seem like a fitting trait for your patron anyhow; Asengav seems like a more quiet observer.
 
Like Western Robot has said, Allies can be treated as complete characters, with their own patrons and everything; in that case the Allies perk can be rerolled. But if you want to keep the Allies perk, then the allies share the same patron that you have.