Hello @Cazy, and welcome to the forum!
This set is said to have good brushes for comic and manga:
NEW LINK since the above seems to be defunct:
This is a specialist for this topic:
Mojo Moo for comics
And if you want to search yourself, then take a look at our page for Brushes and Bundles - Krita Artists, and always scroll to the very end to reveal more and more bundles for Krita till the site says there are no more bundles to discover.
Michelist
Add/Edit: Since Ufile.io seems permanently defunct, I added an alternative download location.