@@Its_Fandi i never said he designed the characters in that video, of course he has designed those characters years before based on the webcomic models.
It's a type of ink pen with a brush tip, I bought mine looking for sales sites with the name brush pen, try looking for something similar to see if you can find it.
Seeing Murata drawing makes me very inspired, I don't know what your drawing style is like, much less how long you've been drawing, but if you practice, you'll definitely be at a great drawing level.
