I wonder if it's possible to try find a way to contact Toshiya Murakami - 村上 としや?
The question posed to them would something like "what notes/instructions did you received before illustrating a chapter?"
Knowing such would help regarding Char's appearance in the ZZ manga.
How Yamucha x Tien should have gone.
image source: https://t.co/8MSF0aWvA9 https://t.co/3QcTypAhAX
[From 64Dream #014 November 1997]
image source: https://t.co/vsSusjpxf4