These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Awesome Music: Whether it be made by a well-respected producer or the boys themselves, the group certainly gives out a lot of this.
Their debut song "Lovesick" was incredibly successful for a reason - it won them many awards, was played non-stop and made the boys one of the most successful rookies in kpop ever.
A good chunk of their rock ballads since it is what they're best known for. For example, besides "Lovesick", there's the successful "Severely" and their highly-respected Japanese ballads "Raining" and "Distance".
Much of their Japanese music, both indie and post-indie. The general fan (and even non-fan) consensus is that it's better than their Korean music since they have more creative control and a distinct sound here. Besides the Japanese ballads mentioned above, the Japanese songs that are praised the most include "Stars", "Flower Rock", "Paper Plane", "beautiful", "Morning Coffee" and "To the light".
Big Lipped Alligator Moment: In the "Hello Hello" MV, when Hongki is outside looking at the burning building and it gets to Jaejin's lines, it switches to Jaejin on a TV screen while sitting on a firetruck and rapping. When he's done, it switches back to Hongki looking on uncertainly and no reference to Jaejin on the firetruck is made afterward. It makes no sense even as a performance aesthetic (all other performance shots are inside the building), and even less sense since he's actually in the burning building the whole time.
Nothing intense, but there are fans who prefer their older rock ballads (up until "Bad Woman" era) and don't like their change of direction, while there are also fans who dig their rockier sound change and couldn't care less for their older music.
Fans either like Han Seungho the good and beloved CEO or hate the greedy and inconsiderate CEO.
"I Wish" is either a good Ear Worm or too generic for the band.
Counterpart Comparison: What they, labelmate CN Blue and both fandoms have to grudgingly deal with. Both are from FNC Entertainment and the two most popular idol bands in Korea. Thus people are quick to compare them in terms of music and success - even though both have their own charms and taste in music.
Ear Worm: Quite a few of their songs, especially ones where the chorus repeats lines/words:
"I Hope" - it's very common for fans to be singing the "barae" lines very loudly.
"Flower Rock" - ''everybody, HANDS UUUUUUP".
"Love Love Love" - annyeong nae sarang sarang sarang!
"Hello Hello" - the "hello hello" and "goodbye goodbye" lines are infectious.
Ensemble Darkhorse: Everyone that isn't Hongki within the fandom. FNC may have trouble promoting the others but fans love and appreciate all members just about equally.
Jaejin's voice; he's the bassist and doesn't sing as much as Hongki but more and more fans, while acknowledging Hongki as the better singer, prefer his voice to the latter.
Seunghyun; he's the rhythmic guitarist that sings less than Hongki and Jaejin but many fans also adore his voice - in particular, his musical work has put him in a whole new light for some. And, though his looks aren't particular emphasised, fans and non-fans alike have found him to be extremely good-looking and aging well in later years.
Face of the Band: Hongki, due to being the main vocalist and given the most activities, thus even the most typical kpop fan can usually only name him. One website even took it a step further and published a news article titled "Lee Hong Ki and FTIsland's 2015 FTIslandxThanx Tour is coming to the US!"note While said website is a Korean Drama site and simply highlighted Hongki's name since he's a well-known idol actor, it doesn't explain why the title was worded in a way that made it look like Hongki isn't even in FTI.
Fan-Preferred Couple: Though of course none exist (probably), fans prefer the following ships the most due to the amount of Ship Tease and Ho Yay they give; Jonghun/Hongki, Hongki/Jaejin (yes those two are very even in terms of supporters and fanfics and it doesn't help that not even Hongki could decide between the two), Seunghyun/Minhwan.
Fandom Rivalry/Friendly Fandoms: While FTI and CNB get along well and support each other, their fandoms... are very split. This is due to the two being both the most popular idol bands in Korea and under FNC. Thus, their fans have become very nasty to each other and look down on the opposing band's achievements just to make their bias band look better. Yet somehow both sides refuse to admit their own wrongdoings and proclaim they've been nice to each other and have done nothing wrong. Luckily, there are also just as many rational fans who also like/respect the opposing band, and they're the only ones who understand that the two bands are not to blame for each other's downfalls. These fans have a hard time dealing with the irrational fans and give up trying to reason with them.
Germans Love David Hasselhoff: They fare much better in Japan than Korea. Justified as Japan is more band-friendly and they went indie there before their major debut. It helps their singles are never remakes of their Korean songs, they're more fluent in the language than other Korean idols promoting there and that majority of their self-composed songs are for their Japanese promotions. As a result, they are more active there than in Korea.
Hilarious in Hindsight: When still a member Wonbin mentioned he had his name changed to Seonghyun because he was teased a lot for sharing the same name as famous actor Wonbin, but he chose to use his original name after joining FNC. The person who would take his place after leaving would be Song Seunghyun.
The climax of the "Severely" MV where Hongki dies saving AOA's Seolhyun from getting hit by a car. Except many people noticed the car wasn't anywhere near her when he got hit. Probably more of a problem with the editing than anything else but it's still doesn't explain why he couldn't simply pull her to the side (which he did do before) instead of running in front of the car. Seolhyun's character is also disturbingly careless when crossing the road, walking on a red-light twice simply because she's wearing earphones.
"I Wish" MV, where AOA's Hyejeong seems to be in a happy relationship with all the members (except Hongki) at once. Without any of them noticing. Despite them very likely living in the same house. And none of them ever get resolved.
Their drama MVs can be this, playing up the melodrama which makes it hard to take any of them seriously. The older ones typically follow the same formula: "boys meet a girl and both fall in love, girl falls for one of them much to the sadness of the other guy, and somehow the girl gets kidnapped or otherwise endangered and the boys get beaten up." Or stabbed.
Some fans would rather not remind themselves nor anyone else what the name FT Island actually stands for. The "five treasures" is acceptable since it's symbolic, the "island" makes... not as much as sense and is not nearly as cool as the members/FNC make it out to be.
Hongki's bad singing moments, notably the Gayo Daejun performance in 2008 and his offkey moment in the "All I Want For Christmas Is You" cover.
Jaejin was once caught farting in the car, so now all car-farts are blamed on him.
Hongki would mention Jaejin's break-up non-stop during "I Wish" promotions.
The members to Jonghun and him crying at one of their Japan tours.
Non-humorous example: ever since Hongki said they were CN Blue's labrats, everyone seems to want to take a jab at either bands and compare them or ask them about their rivalry, which both parties (and fandoms) are clearly sick of.
When talking about their success people will never fail to comment, "If only they didn't go to Japan at the peak of their popularity." Though many will argue Japan is also the best thing it's ever happened to them.
Portmanteau Couple Name: For the noteworthy pairings, Jongki (Jonghun/Hongki), Seunghwan (Seunghyun/Minhwan), Seungjae or Seungjin (Seunghyun/Jaejin) and Hongjae (Hongki/Jaejin).
Shipping: As expected of any kpop fandom, there are many ships involving these guys.
Nearly every pairing within the band have their shippers due to their close friendships which of course is all the shipping fuel needed for most fans.
Seunghyun and labelmate Juniel. They're often found next to each other, were playful together when pre-recording a Gayo Daejun collaboration and there's a photo of them and other members at a staff wedding with Seunghyun's arm around her. It helps they share(d) the same guitar teacher. Though Juniel has denied dating rumours, it hasn't stopped shippers from dreaming.
Jaejin and AOA's Mina have their fair share of shippers, despite not showing much public interaction. This seems to be due to fans noticing the two having worn the same bracelets once; though it's common for idols in the same company to wear similar clothing due to sharing a sponsor, the discovery was made after Jaejin admitted he was dating and refused to say who it was, which lead to much speculation. It helps she was his wallpaper once and that he (and CNB's Jungshin) helped her with the bass predebut.
Seunghyun chose not to join SM Entertainment because part of the contract was to sell rights to his body.
Some were disturbed upon finding out Hongki's love interest Seolhyun from the "Severely" MV was born in 1995, hence nearly 5 years younger than him and making them 17 and 21 at the time. Thankfully the most intimate they got were two brief hugs and holding hands.
Tastes Like Diabetes: Many other of their Lighter and Softer B-sides, especially their older ones, due to the overly sweet lyrics. The best example is their self-titled song "FT Island", due to the corniness of the lyrics and how cutesy it is. Just hearing the words "chocolate" and "puppy" in Engrish is enough for English-native speakers to cringe. It's endearing for fans though and was a must-have for concert set-lists for the first few years.
Tough Act to Follow: Colorful Sensibility and "After Love" didn't fare well unlike its very successful predecessor Cheerful Sensibility and "Lovesick". This was partly due to being released after a long absence from the kpop industry, and partly due to the album sounding too similar to the previous one.
Yoko Oh No: Averted mostly since the members don't hide that they date (they just don't say when) and most fans are perfectly fine with that. Exceptions come up though
Some fans hated Fuji Mina when she and Hongki filmed "We Got Married" and have called her ugly, stuck-up and too boring/not good enough for Hongki. Thankfully they're only the crazy minority of the fandom; most fans liked her and even joked she's the one who's too good for him.
One girl posted a photo of her and Hongki (and a AKB48 member) on her instagram in about May 2014 but then deleted it - and some fans saw this as her "being an attention seeker" and "pretending that they're secretly dating". The ridiculous overreaction was thankfully short-lived.