Capt. Fred. Whittaker
3 appearances across 3 restored issues — every one readable in full, free.
Beadle's New York Dime Library, No. 378 — 1886 “From the Bottom to the Top of the Ladder” · p.1 Read the full issue (32 pages) → 
Beadle's Dime Library No. 412 — 1886 “A Fight for Fortune: A Story of Labor and Capital” · p.1 Read the full issue (32 pages) → 
The New York Dime Library, No. 1096 — 1905 “The Showman Detective; The Mad Magician” (serial) · p.2 Read the full issue (32 pages) → Appearances are extracted from each issue's own printed contents page; entries we can't read confidently are withheld rather than guessed.