Given the general freedom and dialog trees, I think Witcher falls pretty cleanly into WRPG. You’re not going through character creation, but you do get to define his morals and behavior. The Witcher games do tell you how a Witcher is supposed to act, but they also put you in situations where it’s pretty unambiguous that the morally correct choice would require going against those guidelines. For example, you take and complete a job for a very poor character and their offered payment would clearly mean major hardship for them. The Witcher’s code dictates that a Witcher must always be paid for a job, but the game still gives you the choice to decline.

If it was a JRPG (by my definition above, which I will admit may not be wholly complete or fit every use case, but is more of a ‘general rule’ thing), if Witcher started and ended every quest with a cutscene where you could not interact at all, and the player was only given agency to execute the quest, it’d be closer to a JRPG.