Is Kazuki Takahashi also the character designer of his show?

When I watched Yugioh as a kid, the character designs fascinated me. Now that many years have passed since childhood, I understand more clearly that these character designs are no joke. I looked up who’s the character designer of the mentioned show is, but there is no answer specifically stating that Kazuki is also the character designer. As you might already know, sometimes the illustrator is different from the one doing the character designs on a specific show… so my question: Is Kazuki also the character designer of Yugi, Kaiba, Ishizu and Dark Magician etc. ?