Ok I finally have time for this.
Janga and Joka have always been my absolute favorite villains, either as a duo or on their own. Joka maybe a teeeensy bit more so in recent years. They're both like. Stupidly important to me, though.
Janga's probably self-explanatory, he's just a Super Good Villain in both design and characterization. Like dang.
Joka is like, I've seen mixed opinions on what his actual personality is? Probably because he's just a silly, admittedly incompetent underling in DtP. In games proceeding that he's lot more clever and conniving and tricky (even though it usually backfired on him in the end) and that's what I love about him. He's a lot more capable in those games (especially NxC). Adorable and flashy and charismatic, but snidely alluding to the fact that he has bigger plans. Which usually involve some sort of Ultimate Darkness™. So like, basically, my role model.
I don't think there are any (major) Klonoa villains that I actually dislike but KoS should at least get honorable mention.
I like A Lot of villains outside of Klonoa, too. I am the villains girl, it's me. I already rambled enough, though, so,