The current prime suspect in this episode of Castle is an obsessed shipper (and how does Castle not know about shippers?). Named
Cassie Edwardsa. There's no meta corner this show won't explore, I swear.
...This is a frighteningly accurate portrayal of internet fandom, actually. Crazy BNFs, online petitions, crazy shipping mascots and all.
(there is now a new prime suspect, and we've abandoned the "delusional BNF" angle"