From cast + -worthy.
castworthy (comparative castworthier or more castworthy, superlative castworthiest or most castworthy)
- (entertainment, films, theatre) Worthy or fit for being part of a cast or of being casted.
1987, Vivienne Knight, Trevor Howard: a gentleman and a player: the authorized biography:
- As had Wilfrid Lawson and it is pleasant to record that, after The Devil's General, he was once again considered castworthy and went on to play several other roles.
2001, Gardner Dozois, The Year's Best Science Fiction: Eighteenth Annual Collection:
- That's what we're promoting here, the more he's in the casts, the more castworthy he is.