Hope this list isn't too varied or too vague. Thanks in advance for reading it!
1) Fics where Reid is/becomes good with guns and gets to show his stuff, or where someone underestimates his ability with guns/makes fun of his revolver and the way he wears it - only to find out that it's never good to underestimate a guy advertises the fact that he's packing the way Reid does :p I just love the idea of Reid as a gun nut. I prefer Hotch/Reid as a pairing but will also appreciate gen recs or well-written Reid/Prentiss.
2) In-character Reid/Prentiss, preferably long and where the two are portrayed as professional equals.
3) Hotch/Reid where someone else's perspective on the couple is given. Like, someone's thoughts on the age difference, their professional connection, whatever. Eh. That's probably clear as mud but here's hoping somebody gets what I mean :p
4) Hotch/Reid where Hotch is in danger/hurt/missing and Reid has to deal. No emasculated (ooc) Hotch, please.
And finally...
5) Hotch/Reid, Prentiss/Reid or gen fics where Reid's lover actually sees him shoot up or high...
6) Or fics where someone questions Reid's ability as an agent, not because of his physicality (which is pretty common) but because of his history with drugs or his tendency to confront unsubs unarmed :p Basically, fics where someone realizes Reid can kind of be a wild card.