Bimoji (beautiful letter) pens from Kuretake in Japan are traditional Japanese brushes in modern marker form. The Usuzumi version features a light gray water-based ink in a bristle-type brush tip. The "Cambio" series features a continuous ink flow system with a solid barrel that doesn't require squeezing to release ink. Plus, when the ink runs out, the barrel cartridges are replaceable!
Refills available here.