I set out to find what were the most popular NCIS stories on Fanfiction.net, as measured by how many times they had been reviewed. After I found the 25 most popular, I also looked at how many times they had been reviewed per chapter, as an imperfect proxy for relatively how many people each story had following along with each update.
It surprised me just how popular some of these stories were. The most reviewed had over 3700 reviews, which was 1800 more than the next most reviewed. All the stories on the list had (essentially) a thousand reviews or more.
1.
"My Girl" by angel-death-dealer
Reviews: 3729
Reviews per chapter: 47.2 (Rank: 3)
Character or Pairing: Tony/Ziva
Summary: As she dies, Alicia Ryan leaves Tony a parting gift; the daughter he's never known. Determined he can't be a father, it's up to his team, his true family, to prove that he's capable of raising three-year-old Penny. Tiva and McAbby
2.
"Transitional States" by Rigil Kent
Reviews: 1942
Reviews per chapter: 21.1 (Rank: 18)
Character or Pairing: Tony/Ziva
Summary: Eighteen months after the end of the undercover operation that blew up in their face, life has settled into a routine for Tony and Ziva ... but things are about to change dramatically. Goes AU early season 4, Part 3 of 3. ABANDONED DUE TO DISGUST W/NCIS.
3.
"Six Months Home" by AliyahNCIS
Reviews: 1715
Reviews per chapter: 29.6 (Rank: 9)
Character or Pairing: Tony/Ziva
Summary: Ziva prepares for an event that will change her life in many ways, Tony takes a big risk, Abby and McGee's secret is revealed, and an old friend steps back into Gibbs' life. PART 4 in Remnants of Somalia series, sequel to Three Months Alive
4.
"A Life Reclaimed" by JibbsGal1
Reviews: 1617
Reviews per chapter: 14.8 (Rank: 21)
Character or Pairing: Gibbs/Jenny
Summary: This is the sequel to "A New Life," which should be read first. I'm afraid to put what else it's about in case you haven't read the first story. But if you have, it's the continuing adventures of our favorite new family.
5.
"Princess McGee?" by chelsea1234
Reviews: 1578
Reviews per chapter: 13.5 (Rank: 23)
Character or Pairing: McGee/Abby
Summary:This is the fourth story in my series about the McGee family. In this story Tim and Abby adopt a six year old girl named Jess. McAbby, Tiva and the rest of the gang There will be discipline spankings in some chapters.
6.
"The Taming of the Two: A Tony & Ziva Love Story" by rekkidbraka
Reviews: 1457
Reviews per chapter: 7.0 (Rank: 25)
Character or Pairing: Tony/Ziva
Summary: The ongoing romantic / comedic / angsty adventures of Tony DiNozzo and Ziva David. CHAPTER form. UPDATE: "Loca" - Deeks? Jealous of Tony? NCIS:LA xover. TIVA meets Kensi/Deeks
7.
"Just One More" by Aldea0402
Reviews: 1449
Reviews per chapter: 15.1 (Rank: 20)
Character or Pairing: Tony/Ziva
Summary: Tony knew the moment Ziva's son was put in his arms, he had to change his shattered life. Can they move past all the half truths and misspoken thoughts and build a life together? Or will people from Ziva's past push them even further apart?
8.
"Tali" by kandyfan4life
Reviews: 1314
Reviews per chapter: 13.5 (Rank: 22)
Character or Pairing: Tony/Ziva
Summary: Tiva future fluff. Plus the team.
9.
"Down to the Depths of Hell" by AlkalineTeegan
Reviews: 1304
Reviews per chapter: 23.3 (Rank: 15)
Character or Pairing: Tony
Summary: Casefic with ensemble cast. Everyone knows Tony's not happy as agent afloat, but when the team gets some startling news, is all as it seems? Or is something even more disturbing going on? Warnings for language and dark themes. COMPLETE!
10.
"Dinner Interrupted" by Mulderette
Reviews: 1256
Reviews per chapter: 27.9 (Rank: 11)
Character or Pairing: Tony, Gibbs
Summary: Tony's life is endangered when he is caught up in a plan for revenge against Gibbs. Father/Son themes.
11.
"Where the Teddybears Have Their Picnic" by xenascully
Reviews: 1255
Reviews per chapter: 29.9 (Rank: 8)
Character or Pairing: Tony, Gibbs
Summary: Tony goes missing for over a month. When the team finds him, he's not the man they knew...
12.
"Lifetime of Lies" by JasonMorganfan87
Reviews: 1244
Reviews per chapter: 24.4 (Rank: 14)
Character or Pairing: McGee, Gibbs
Summary: After his mother makes a surprise visit, McGee learns that he has been lied to for his whole life, and that he has a surprsing connection to Gibbs.
13.
"Fitting Pieces" by Detour
Reviews: 1217
Reviews per chapter: 42.0 (Rank: 4)
Character or Pairing: Tony, Gibbs
Summary: Preseries. Yeah, it's another fic dealing with how Gibbs met Tony in Baltimore. But come on. Don't you kinda love 'em? Some OCs, crazy action scenes, grumpy Gibbs and unreadable Tony. Eventually some Ducky, Abby, and, you know, an actual case.
14.
"Safe Harbor" by Richefic
Reviews: 1118
Reviews per chapter: 38.6 (Rank: 5)
Character or Pairing: Tony, Gibbs
Summary: Gibbs wasn't known for his patience with new recruits. But then he had never recruited anyone in the same circumstances as DiNozzo. Even so, the transfer from Baltimore PD to Washington NCIS doesn't exactly run smoothly.
15.
"Still Alive and Kicking" by xoxEllexox
Reviews: 1108
Reviews per chapter: 19.8 (Rank: 19)
Character or Pairing: Tony/Ziva
Summary: Sequal to Deterioration of the Fight or Flight Response. The four mysterious people are back in Washington. What happens when slowly the team find out who they are? And how are they connected to the Triplets? Will Tony and Ziva's marriage survive?
16.
"Fine is a Four Letter Word" by secretchild
Reviews: 1083
Reviews per chapter: 36.1 (Rank: 6)
Character or Pairing: Tony
Summary: When Tony collapses while pursuing a suspect, he insists it's just the flu. Things are never that simple. Abby/Tony friendship,Tony/Gibbs father/son. Gen, friendship/family with a healthy dose of angst. Set early season 5. Rated T for language. Complete!
17.
"Daddy's Boy" by Headbanger Rockstar
Reviews: 1081
Reviews per chapter: 33.8 (Rank: 7)
Character or Pairing: Tony, Gibbs
Summary: Sequel to Terminal Orders. Explores episodes of the first year Tony lived with the Gibbses. Warning: Violence, Child abuse and abandonment. AU & OOC. TonyGibbs Father/Son. No flames, don't like don't read. 2nd story in Terminal Orders Series.
18.
"Of Jews and Gentiles" by Sashile
Reviews: 1062
Reviews per chapter: 24.7 (Rank: 13)
Character or Pairing: Tony/Ziva
Summary: asefic. After investigating an attack on a Jewish lieutenant and her non-Jewish boyfriend, Ziva discovers a pattern of similar deaths. An undercover mission with Tony as her boyfriend leads to some dramatic discoveries. No OCs, lots of Tiva.
19.
"Caught Between a Rock and a Gibbs" by Florence1
Reviews: 1062
Reviews per chapter: 28.7 (Rank: 10)
Character or Pairing: Tony
Summary: Tony is injured but no one knows how or why, Worse Tony himself is distinctly uncooperative, who or what is he covering for and why? Complete, epilogue added
20.
"Backfired" by Emi-Lynn
Reviews: 1036
Reviews per chapter: 21.6 (Rank:17)
Character or Pairing: Gibbs/McGee
Summary: When two agents wake up in bed together with no memory of how they got there, it starts them on a path to where they never thought they'd go.
21.
"A New Life" by JibbsGal1
Reviews: 1035
Reviews per chapter: 11.3 (Rank: 24)
Character or Pairing: Gibbs/Jenny
Summary: Gibbs finally takes a long awaited vacation, but something - or someone - happens to change everything.
22.
"The Long Road Home" by ncismom
Reviews: 1013
Reviews per chapter: 24.7 (Rank: 12)
Character or Pairing: Gibbs, Tony
Summary: Gibbs' latest obsession results in a tragic incident that will change Tony's life forever. Father/son. Story Complete!
23.
"Hoping for Happiness" by jaelke421
Reviews: 1007
Reviews per chapter: 21.9 (Rank: 16)
Character or Pairing: Tony/Ziva
Summary: Tiva romance. Chronicles their transition from friends to something more. Departs canon after Child's Play. Warning: Mention of rape and torture. Adult sexual situations.
24.
"Rag Doll" by cheekymice
Reviews: 997
Reviews per chapter: 52.5 (Rank 1)
Character or Pairing: Tony, Gibbs
Summary: Tony finds himself cut off from the rest of the team when Vance sends him on a difficult and unpleasant undercover assignment.
25.
"Cadence" by Sparkiebunny
Reviews: 995
Reviews per chapter: 49.8 (Rank: 2)
Character or Pairing: Tony
Summary: A case, a little girl, an explosive impact. Tony-centric, hurt!Tony.
(Caveat: Because Fanfiction.net has extremely annoying filters, I may not have managed to find all the most popular fics, but this list should be pretty close. Review counts as of 6/10/12.)
Turns I've read surprisingly few of them. While the ones that I recognize are truly excellent stories, a few of the others look like the kind of fluffy nonsense that would make me hit the back button fairly quickly. À chacun son goût... How many have you read?