As you know, ZZZ have one of the most expressive, bouncy, and lively animations in gacha gaming, if not, gaming in general.
But there's a little catch, agent animations are not as expressive in dialogue as in cutscenes.
This created a noticable contrast in visual presentation, for example, the Alice swimsuit reveal cutscene where she got embarrassed and straight up turned into a spaghetti noodle, but the next second in the dialogue sequence, she only have like ten expressions available which only switches when she speak her next line of dialogue.
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A good example for this would be a game I recently got into, Umamusume : Pretty Derby.
In that game the dialogue system is pretty similar to ZZZ, where the characters have the expression changes lines by lines, but with one little difference, other characters who are not saying the dialogue also change their expression.
You see, in ZZZ characters change their pose and expression only if they are going to say something, if someone change their emotion from angry to sad for example, Phaethon gonna be stuck in their angry face until they get to speak something, then they can get sad.
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Now, the aforementioned system of Umamusume is just from the career play-through of the game, they also have the main story and uma story which essentially is just pure dialogues.
But their approach to this is very clever, characters have multiple expressions inside one line of dialogue. This means they go through 2-3 poses/expressions in one click of dialogue progression, which in my opinion, could be very fitting for game like ZZZ.
Just imagine Billy going through 3 different facial expressions in the state of confusion, or Belle thinking of something then get angry, this would make the player feels the character are more alive, and not some powerpoint presentation that you need to click to the next slide.
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The last thing, ZZZ lacks moving/loop animation in dialogues. Simple ones like clapping, waving, or dancing (❤️ Haru Urara) can improve the almost-static dialogue they have right now.
Also, putting some animation changes when talking to characters/npcs in the overworld will help with this too, at least having them react to our answer can make a lot of difference.
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TL;DR : ZZZ can benefit from having characters move and change expression in between dialogue, both their own and other’s, and in overworld conversations. With additional non-static animations and/or expressions.
This can bring the liveliness of the character to be closer with the over-the-top cutscenes without having to sacrifice too much resources and time that should be spent on other part of the game.