Ruben Diaz
Ruben Diaz is credited as writer on 16 issues, inker on 1 issue and letterer on 1 issue in grailworth's catalog, 11 issues of them across 7 series we value. Characters first seen in issues they wrote or drew include Firepower.
Characters they introduced
Every issue
Impulse (1995) 2 issues
JLA: Black Baptism (2001) 4 issues
Justice League Quarterly (1990) 1 issue
Showcase '94 (1994) 1 issue
Steel (1994) 1 issue
Credits from the Grand Comics Database, CC BY-SA 4.0.