When I visited Tokyo I happened across a pen I really liked, and luckily it has many variations. The pen was a Kuretake brush pen, though it took me a little while to figure out what it was, as almost nothing on the pen was written with roman letters or English.
The Kuretake No.55 is an excellent double-sided brush pen. I like how it was a bit smoky, it was a lot like drawing with water on a Buddha Board. Here is a detail photo of a warmup drawing I did, where you can see the smokiness of the ink pretty well:
I went on to make this drawing of lupine with the pen:
What I really like about this pen is that the two nib sizes are about all one really needs to make a good drawing. The ultra thin brush is nice to do detail work, and the larger brush on the other end is good for shading or blacking out large areas, and larger linework. And it’s just one pen, so it makes working much quicker.
The ink does take a bit of time to dry so it’s a good idea to work from left to right in a drawing (if you’re righthanded like me, if you’re lefthanded, the opposite of what I just said), or to not draw on the right and then switch to the left quickly, because the ink got on my hand pretty easily. But I actually like that it dries slowly. I think it’s what gives the ink it’s smoky, pretty look.
Here’s the other Kuretake pen I’ve used that I really liked - it was an impulse buy when I was in Tokyo. I didn’t know or understand anything about the pen, something about it just felt right and it looked cool, and it wasn’t so expensive that I felt it was out of reach, so I picked it up:
Kuretake offers many other pens, and they also make eyeliner pens and other cosmetics? (Seems like a fair enough product diversity offering). The pen I got in Japan was a single-sided deep black pen, but I liked this double sided pen quite a bit more. It felt more versatile and is smaller, so easier to use.