Whistler

Whistler is the man who trained Blade.

Biography
Whistler found Blade and, recognizing his potential as a half-human and half-vampire, trained him to hunt and kill the undead. He came up with many weapons including a serum to help fight Blade's vampire urges. They came to New York City to hunt Michael Morbius but Spider-Man stopped them. They later assisted Spider-Man and Morbius in fighting Mirium.

Background
Whistler was voiced by Malcolm McDowell in his first two appearances and Oliver Muirhead in his latter two.

The character was created by David S. Goyer who wrote the first Blade film. This is the first version of the character and has yet to appear in the comics despite being prominently featured in the film series and live-action television series. 

He is based on Jamal Afari, Blade's mentor in the comics.