Meaning a reference or nod to something else that inspired your fanfiction (or just something that inspires you in general). What kinds of references do you manage to work in to your writing, to what and why?
For example, when I participated in Nanowrimo in 2009 I tossed in a few arbitrary Naruto references here and there just because. You probably wouldn't spot them unless you knew what to be looking for, but:
1 - Smeargles are known for painting the pawprint on each others' backs as a social measure, right? One character in my 2010 setting was a Smeargle wose pawprint mark has several slashes painted across it -- a sign of being exiled from his clan. (In Naruto, renegade ninja have their identifying metal headband slashed out.)
2 - Another character was a Ninjask who fought almost exclusively by using the Shedinja like a remote puppet. (Not unlike a certain Naruto sand ninja, Kankuro...)
In my 2012 Nanowrimo, there were isolated references to Pokemon Conquest (a Zoroark named "Kotaro"), Pokemon Ranger (details of which are a spoiler), Doctor Who (Shedinja only move when you're not looking at them), even The Lion King (an exiled female Luxray named "Zira"), and probably a few more I can't name off the top of my head.
So any of yours that you'd like to share?