Noodlers makes some unique pens and inks. I have a Noodlers Ahab, for example, that has a very flexible nib. Different than any of the more conventional pens I used before.
But one thing that bothers me about fountain pens is that they are messy. Some of it can be avoided. You don't need a piston filler to dip into your special ink bottle to refill your pen if you don't mind using regular cartridges. But one thing that seems unavoidable is that the "section" (the part where you hold the pen) gets messy when you put the cap on it. I wonder why every fountain pen seems to have this design. One would think that a smaller cap that only covers the nib would suffice.
I wonder if there are fountain pens like this. I feel another rabbit hole calling.