Why Yarpen rather than Zoltan? I've only played the games, haven't read any of the books, but in the games Zoltan's a main character and Yarpen's a bit part (I just had to look him up online to find out who he was, and I've played on his side).

Is Yarpen a more prominent character than Zoltan in the books?

Definetly Yarpen is the one.
He's also - in my humble opinion - one of the most colourful character in the series, beside Dandelion.

After reading the series I must say that Yarpen is one of tche characters for whom the book are worthy reading.

Definetly Yarpen is the one.

He's also - in my humble opinion - one of the most colourful character in the series, beside Dandelion.

After reading the series I must say that Yarpen is one of tche characters for whom the book are worthy reading.

Is he a big character in the books then? Any idea why they chose Zolton for the computer games?

Man I'm looking forward to The Witcher III...

It is all on where the two Dwarves are at the time of the game and stories.