He definitely has 4 fingers on each hand in his intro cutscene, so I really have no idea what you’re talking about there. Can you provide a screencap from any moment in the game that shows 5 fingers on his hands?
We already had this discussion here in the forums back in may when the first footage of Zer0 was revealed: What the hell happened to Zer0?.
It seems about 99% of his lines are still in haiku form. The only ones that aren’t are single words or short sentences. Same as it was in BL2, actually. He didn’t speak solely in haiku in BL2 either.
Zer0 was all smiley faces, LOLs and <3s back in BL2, both in game and in promotional material. Also, the first two emotes we see on his helmet in BL3 are actually “WTF” and “GTFO”. Hardly what I’d call happy and upbeat. You’re kinda stretching your argument on that one. Zer0’s personality seems to be pretty much the same to me.
Dude just changed his suit, nothing more to it. Nearly ten years have passed since BL2. All of the returning characters have new looks. This really doesn’t mean much.
Like VaultHunter101 said above, his name card on his intro cutscene shows the usual strikethrough zero at the end of his name. I’d say you don’t see that on all of the game text simply because of the font choice they decided to go with.
Honestly, I think your impression that something is “off” about him is coming from just not being used to interacting with him as an NPC. As an NPC and quest giver, he has to have more lines and they have to be much more varied and specific than in BL2, simply because now he has to communicate exposition and clear directions. Now you’re having a dialogue with him instead of being him, so his personality is just going to be that much more noticeable (and you’ll see those emotes more often). That’s why you think he’s happier and more upbeat or that his speech pattern is different. The character really hasn’t changed much at all, it’s the dynamics of your interaction with him that have. That’s all there is to it, really.