The only time I felt weird about Brook was at the start, I was like, he is a skeleton what One Piece world logic is behind a skeleton running around alive and how is he going to leep going like this but character wise I really liked him, dude is funny and has a fun battle style and his flashback hit in the feels, plus the Devil Fruit was explained and at this point I'm expecting Brook to die at the end of the series after meeting Laboon.
I've only seen Franky and Brook join in real time(as in reading the manga) and I didn't have any problem or needed any time to adapt to them but yeah I remember people hating on Franky and then on Brook, I think it usually comes from "the character from that arc that I wanted to join didn't so I'm going to hate on the character that actually joined", at least in Franky case it was since I remember a lot of people wanting Paulie to join and I see the same with Jinbe, people wanting him to die just because Perona, Boa and Shiraoshi(lel) not joining instead of him.
@King:
Except they aren't going by what we have seen from that little girl. They're pretty much furry humans, a niche that Chopper already fills in the crew and is the main reason he's unique (in fact, it is the whole reason Luffy was even interested in him in the first place).
Jinbe and Chopper are completely different in terms of animal thematics.
The Mink would still be different, like I said by that logic we have a shitload of humans with different hairstyles, just because Chopper is the small cutesy animal person I don't see why that makes a Mink not join, Chopper isn't a Mink and no Mink aren't furry humans, they are minks, Giants aren't big ass humans they are giants, its a different race.
I don't like to dwell in ifs anyway I prefer to speculate on actual things that happen in the manga, we have more than one glutton in the crew, we got a lot of dumbasses, 3 pervs, 2 people that love building things, quirks have been repeated, just because Chopper is the small cute animal it doesn't mean we can't get another and we don't even know how all he minks look, we don't know if they are small and cutesy like that girls looks like.
I'll wait for actual info on the chapters before I talk more about this.