tips on making a non traditional costume scary?

hello all! this is my first year working as a scare actor and i am stumped as to how to be scary. im supposed to be an elf in a christmas themed haunted house but i honestly have no clue how to make santas elf scary, the best ive been able to come up with so far is just yelling christmas themed threats at people and that would be disappointing for guests. im in the final room of the haunt with another guy who has the power tool to chase people out so im supposed to be the one with a more fleshed out character. any help is greatly appreciated!!