Hellboy is a fictional character created by writer-artist Mike Mignola. The character first appeared in San Diego Comic-Con Comics 2, and has since appeared in various eponymous miniseries, one-shots and intercompany crossovers.
Add actors/actresses and cast the roles/films/series that they were rumored, considered, offered, negotiated, auditioned, turned down, and/or originally casted before getting recasted. (Please double-check in research.)