CREATE TABLE table_6590 ("Release date" TEXT, "Length" TEXT, "Director ( s ) " TEXT, "Character name" TEXT, "Character type" TEXT, "Leading lady" TEXT)

What was the character name for the film with a release date of July 29, 1938?
SELECT "Character name" FROM table_6590 WHERE "Release date" = 'july 29, 1938'
SELECT "Character name" FROM "table_6590" WHERE "Release date" = 'july 29, 1938'