Watch their voices change between games for a few key reasons starting with budget stuff since production costs keep going up and theyre switching to cheaper talent especially noticeable in 9 where zhang liao and xu shu got new voices that didnt land well with fans. The timing gets interesting around 2017, when that big voice actor strike was happening and studios had to swap around their talent pool which probably affected development. Sometimes they experiment with different approaches too, like how yuan shao went from super dramatic to more chill in origins, showing how theyre trying different things with the characters.

The availability issue is pretty crucial too since voice actors cant always come back for new recordings, which is why you dont hear andrew russell as zhao yun anymore. Some of the new voices actually work out pretty well though, like kayli mills taking over diaochan in origins where she really nailed the performance. Just keep in mind the whole industry is dealing with all sorts of challenges right now, from traditional union stuff to newer concerns about ai in voice work - its definitely affecting how they handle the english dub situation.

Tip: pay attention to character voices in the early scenes of each new release, since thats usually where youll notice the biggest changes in how they handle different personalities and combat reactions