After I've played all three games, I was somewhat frustrated by changes in these two characters. And I am not talking just about making them ultimate antagonists (that was actually cool turn), but their personality change.
Klax is more prominent example. In Dreamfall: TLJ he is shown as jolly yet somewhat unscrupulous tout, who nevertheless admires April and thankful to her (otherwise why did he gave her potions for free?). And he also willingly gave her his book (for selfish purposes, but nevertheless).
In Dreamfall: Chapters, however, he is shown to have quite a grudge against April. And while you can say that he could had it, but just consealed it, the problem is that in Chapters he is unable to do so.
My opinion is that Klax in Dreamfall is more consistent with TLJ, because in first game he was more of a jokester than some scheming mastermind. His story, how he managed to escape calculator by himself is also fits better - in TLJ he was terrible at math, so had indeed to learn some, otherwise he couldn't become operator for Dream Engine. Also his jolly (D:TLJ) version would also fit his role in Chapters - he was cruel jokester in TLJ, not cruel in Dreamfall after being reformed, and returned to cruelty after azadi took away his magic shop.
As for Westhouse it's quite strange for him to wish to return home after in TLJ he learned how his world had changed. On the other hand in Dreamfall:TLJ he says that he visited Asadir and his visit was "very educating". So it would be more consistent if he was going to destroy magic not becaus he was going back home, but because in Azadir he turned into azadi religion and began to hate magic.
Also I don't quite understand, how he could be connected to Chang's research. She began it 30 years before Chapters, thus almost 20 years before The Longest Journey. Did Westhouse been in contact with her at the time he was drinking and running away from Mercuria? Not quite convincing.
So, what do you think of all that? Did I miss something?