The POSCA fude PCF-350 adds a useful brush nib tool to the fantastic POSCA range.
Opaque water-based pigment ink writes on any surface and won't bleed through paper. Gently pump the push-button to prime the ink into the brush nib. Initial use will be a little dry until the ink gets flowing - don't over-pump as otherwise the ink can flood.
POSCA works on most surfaces and is permanent on absorbent media such as paper and card, and can be removed from shiny surfaces with a scraper. To make permanent: