BAU agents and what fountain pens they carry. Part one
Spencer Reid
Spencer carries multiple pens for multiple purposes. His go to is a kaweco sport.
He likes the variety in colors and simple overall look. He adds clips to then so they can be adhered to his pockets and he keeps 2 in a carrying case in his bag. They're recognizable enough that everyone knows they're his pens but not so showy that they draw attention. Hes the most experimental with his outfits and colors so this is a perfect fit, though he probably eyedropper converts some of them just for ink capacity. (And ofc he has no problem remembering what ink is in which pen and which are eyedropper converted)
On his desk he keeps a Twsbi Vac 700.
It has a huge ink capacity so he can write reports uninterrupted. The filling mechanism is unique and he enjoys filling it up and seeing the negative pressure reaction and explaining it to anyone who cares to listen. He also definitely has a vac 20 fill bottle.
As far as ballpoints he carries a few parker jotters
He likes that they're simple, durable, and reliable. He likes to tell the history fact that they were the first reliable ballpoint pens and spurred the transition from fountain pens, and that this was the type of pen used in the shutter island patient interview scene.
If Danny Y. Sexbang was a fountain pen ink he would be Diamine Majestic Blue
Its a medium dark blue with a red sheen that feels strong and elegant. It matches the most common colors of the Sexbang costumes and is overall a fun ink with an elegance to it. This reminds me of Danny because his songs are all fun and a really good time and there's an elegance brought to his music by his voice. He is an unquestionably good singer. I think this ink suits him well.