I use this for everything except the panelborders. Have never inked anything digitally. Simply because I'm very old fashioned.
It is called the G-Pen Zebra. It feels very precise and sturdy, and can make both very fine and reasonably thick lines. And they last for ages. They sometimes feel a bit scratcy when they are brand new, but that goes away once you break them in.
If my perception is correct, it seems like it is one of the more popular nibs among the manga artists.
For the panelborders I have an old wornout Hunt 513.
It is a bowlpoint nib, so it feels very smooth and makes very consistent lines.
When it comes to brushes I use whatever I can get a hold of. Mostly the equivalent of a 2 sized Winsor & Newton brush. When they start to split I cut of the stray hairs. My favourite right now is a cheap, white Japanese brush which hardly have any hairs left on it.
When it comes to the ink itself, I have to types that I usually stick to. For the pens I like Speedball. It flows very good of he nib, and dries immediately. And it is pretty cheap. So I usually draw all lines and hatching, mark of the areas that will be solid black, and erase all the pencils. And then start brushing. The reason I do that is because I don't like how the Speedball ink acts with the brush. So for the brushing I like to use the Winsor & Newton India ink. It covers the paper much better an looks much more solid. But it takes longer time to dry and smudges much more easily. Thats where the white gouache comes in handy.
Also tried a Japanese ink once called Super black. It worked really good in bigger solid black areas. Looked very even and solid. Almost looked like a rubbery skin on top of the paper. But it gummed up the nibs a bit. They also make a white out called Super white that works very good. But I accidentally left mine out in the freezing cold winter, and it started crystallizing.
