In wait
It was a tricky theme for a party. Dress as something that scares you.
It's not like he wasn't afraid of anything. It was a part of his defining outward character that he was an opportunistic coward. Performative screaming and panic was a reoccurring part of his act towards customers and clients. Depending on the client. He was afraid of plenty. Probably.
But he had also trained himself, when it comes to spy craft - and the other part of his job- to block out what scares him. Disassociate. No fear response to threats, weapons, fire, the undead or dangerous creatures.
These two aspects of his life made him not sure what he actually found scary. He thought about it.
There was one time, though he hadn't shown it at the time that he is sure he was afraid of something. Someone. That one bored girl on the roof. He liked her. But she was terrifying.
Dressing like her would suit him.
