Ugh! God that would make sense. Im like in such a minority bubble when it comes to jinbe i just don't want him on the crew lol. He's so darn..."normal" aside from being a fishman nothing about him excites me.
Just did a rewatch of Fi this last week and you can just tell oda was trying to give him some type of personality with the small lil gags that he had but man let him be a commander or something.
You aren't in any minority bubble. Only recently have people come around to the idea of Jinbe and to be honest people accept him because it seems like an inevitability. People hated him for a very long time and still do.
I've been saying Jinbe was going to join the crew since the war, arguing daily about personality, job title, his place among the crew power wise, bounty, etc. I know a guy who predicted very accurately Jinbe would join the crew since before he was revealed on screen. The chapter Sengoku mentioned him going wild he had this amazing write up that for the most part held true even to this day.
But since he's my favorite subject and you brought it up I'll give my 2 cents for the millionth time. We've got roughly 3 straight shooters in the crew amongst a hoard of odd balls. Even then Zoro, Robin and Nami have their quirks. It isn't so wrong that Jinbe would join and be one of the more laid back members. During the war we only got to see him when the stakes were really high and there was little room to be goofing off but we still got to see an amazing side of him in the form a mentor like figure when he snapped Luffy out of his funk. During Fishman Island we saw him a little more relaxed with the eye popping and plan naming. He is always tied by responsibility he puts on himself and each one of those responsibilities he seemed to fail at one way or another.
The day that he is freed from the shackles of Big Mom and his crew no longer has to live the pirate life under her or at all you can bet that he is going loosen up. Expect to see a bit of a Robin like transformation but only at a much faster pace. Everything Jinbe does is for someone else, we'll see a further into his past with that scar on his eye explained and we'll discover exactly what it is he wants. When he's with the Straw Hats he will be able to focus on that and he'll blossom as a character just you watch.
We've gotten hints about who he his and how future interactions with the crew would work, when he joins it will blend in perfectly. When it comes to bounty, a fairly serious personality, back story, etc, he has a ton of elements in common with Robin and I remember first reactions to Robin going weren't very nice. Now we all love her. Everyone will love Jinbe in due time.
But boy when Jinbe was revealed as fat with a big nose there was a lot of complaining. People wanted a new Arlong or maybe someone who looks like Hack. After the decade long name drop people were disappointed and him doing everything even at the cost his life didn't help things either.