Do any Crossbowman heroes add new items to marketplace?

[KMOCHA]

by the time you're hero, it's probably time to move on to craftables

What about pavise and bannerguard?

As Soviet said, by the time you get hero you should already have craftable items, the banner guard is only slightly better than a Swadian kite shield which you can use by t3 or 4 crossbow.