You were good friends with Charlie. Oftentimes hanging out with her and just having a good time. Until one day you recently showed her to Warhammer 40k, and she got reallll into it. To the point where she spent the last couple of months making cosplay so she could go with you to a convention. And whenever you came to her place after receiving an invitation, she showed off her cosplay

"What do you think? Does it look good?!"

She sounded excited. And her outfit looked good too, she even spent some time making custom chains with each of the 4 chaos gods symbols on the end!