And I agree, though I don't remember much of BW to talk about Cheren and Bianca, the cast this time was a huge step up from XY and what essentially never came out of them.
A big part of the blandness of Calem, Serena, Shauna, Tierno, and...that kid with the glasses whose name escapes me at the moment...is that they were written a lot like a children's anime, and not a good one like
One Piece or
Sazae-san, but those merchandise-driven shows that are Japan's equivalent of those 80's Saturday morning cartoons. Another thing is that none of them received any character development, interesting backstories, or plot significance--except for Calem/Serena, they just fell by the wayside when the Team Flare story picked up, and after that, they were back to doing the same things as before. Tierno was the only exception to that, going from a kid with no direction to creating theme teams (he'd love having Oricorio) and for that, he was the most interesting one of them to me.
Also, who was on the right side of history when it came to believing Zinnia in ORAS? I knew she wasn't just some crazy person. JRPG rule of thumb, if a character says it and isn't outright proven wrong it's likely completely true.
Well, that's also the case with fiction in general: If you don't see a character actually do something, any character saying it is the next best thing, unless that character is marked as untrustworthy, dumb, drunk, or a prankster. It's always a big twist whevener a character's statements turn out to be a lie, even when villains say it. I mean, you see it all the time with James Bond: His villains tell him what he needs to know, and they never mislead him. ("No, Mr. Bond--I expect you to die" is famous for a reason: It's a subversion of the usual info dump.)
That's an interesting point, but I do think they did intend for the character to develop over the course of the story. When Lillie gets kidnapped, he laments that he wasn't able to stop it and that's one of the reasons why he joins you and Gladion in trying to save her. So his desire to be strong is highlighted, but it's never truly shown how much he's grown from that low point and his personality remains the same as it did before, so despite the highlight of that low point being there, it's never utilized at all. If the point was to not have the character grow or grow subtlety, I think they missed the mark with him as he doesn't show as much in either category. Even earlier games kind of got that right as you can see nuances in things such as N always having an ever changing team in BW or Silver evolving his Crobat in GSCHGSS, so I think they could've done better with him.
Actually, if you look closely, N fights solely with Pokémon found near wherever you fight him, only a few levels higher. It goes hand in hand with his beliefs that people should not own Pokémon, the implication being that he gathers them nearby, battles the protagonist with them, then lets them go and moves to his next location. That's why N's team is always changing.
My interpretation with Hau is that he gained confidence as the game went on. He put up a happy face but was filled with insecurity at the start, and by the end, his happy face is genuine. That being said, he didn't undergo any character development for a large portion of the game and only found the confidence he needed near the end. It's just that Hau has the same personality and attitude from start to finish. Also, as a character, he is hamstrung by the player character, who by necessity must never lose, so it's hard to write a character who grows more confident if there is another character who is unbeatable and functionally invincible.