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.
YMMV: Fall Out Boy
Base Breaker: Pete. Fans of the band either worship him and think he's gorgeous and a great bassist or they think he's an irritating attention whore who can't play bass at all.
Patrick in the eyes of some fans, especially more considering Pete's unconventional frontman role.
Face of the Band: Pete, and sometimes Patrick. Not many casual fans can name Joe or Andy.
Oddly enough, Patrick, Joe, and Andy were quite comfortable with Pete being the band's face as it meant the rest of them could lead more normal lives without the media intrusion.
Gradually being subverted after their 2013 return. They're doing full band interviews as much as possible and even when they're doing interviews only in groups of two, they're avoiding sticking to the tried and true Pete and Patrick combinations. Andy and Joe are more talkative during interviews, Joe more so than Andy. Patrick and Pete banter back and forth much more than they did in shows before the hiatus, and even Andy joins in! Album wise, lyric writing is no longer solely Pete's role and Andy now has a role with backup vocals alongside Joe and Pete. Let's hope it sticks.
Nausea Fuel: Pete eating that apple-heart and then vomiting up blood and a snake in the "Just One Yesterday" video.
Rescued from the Scrappy Heap: Those who don't like Pete's face/bass playing/everything probably still have their reasons for keeping him in the heap, but those who think he's an irritating attention whore don't have that much ground to stand on these days. His status as The Face Of The Band has been de-emphasized for the whole band taking part in promotion and interviews and parenting has given him perspective and a grounded attitude. He's not all that interested in celebrity anymore either.
The Scrappy: Pete. The Hatedom for this band is mostly because a lot of people really, really, really, REALLY don't like his face/attitude/bass playing/celebrity/everything.