Xirinius
Xirinius is credited as penciller on 12 issues and inker on 12 issues in grailworth's catalog, 10 issues of them across 3 series we value. Characters first seen in issues they wrote or drew include The Bog Beast.
Characters they introduced
Every issue
Psycho (1971) 4 issues
Credits from the Grand Comics Database, CC BY-SA 4.0.