The number of JoJo mangas can be a bit hard to pin down precisely. There are the main series volumes, along with special editions and related works. But you can expect a substantial collection over the years.
It varies. Some spinoffs might build on the main canon or offer alternate perspectives, but not all are strictly considered part of the core JoJo universe. It often comes down to how they tie into the main plot and characters.
Yes, mangas can be considered graphic novels. They share many characteristics such as being a combination of text and illustrations to tell a story. Manga typically has its own unique art styles and narrative structures, but like graphic novels, it uses sequential art to convey a plot, develop characters, and create a fictional world.
Yes, there are. The Pokemon mangas present diverse plots and art styles, giving fans more ways to enjoy the Pokemon universe. You can find them in comic stores or online platforms.