Names:
Bulldog Teeters. (Feature Comics 044, 1941)
Zero the Ghost Detective getting straight-up punched by a ghost. (Feature Comics 051, 1941)
Dates: Johnny Thunder born 7th July, 1917 (Flash Comics v1 001, 1940)
Calling Cards:
He only ever used ’em a couple of times but the Flash had metal lightning bolt dart calling cards.
Costumes:
Absolutely the best Hawkman costume variant is the brief period in which he wore a big hat in the shape of a sassy hawk’s head (Flash Comics v1 003, 1940)