Disco Queen/Dazzler

 Dazzler was originally conceived as a multi-media concept with Casablanca  Records. Originally named Disco Queen, she was conceived as a black disco singer with a character design based on Grace Jones. Originally her power was to force others to tell the truth, similar to Wonder Woman's lasso. However, the proposed writer argued that would not make for interesting visuals, egro a change to light based powers. Marvel would release a comic featuring the character while Casablanca would release a record.  The two companies would co-operate on half hour animated special. Unfortunately, Casablanca ran into financial difficulties and pulled out of the project.

About that time, filmmaker John  Derek got interested in the character as a movie project featuring his wife Bo. The character was retooled as a white singer with facial features based on Bo Derek's and the project started moving forward, this time as a movie/comic project. Unfortunately, the Derek's previous project Tarzan the Ape Man flopped at the box office and they pulled out, leaving Dazzler as a comic only character, appearing first in Uncanny X-men #130

Wolverine

Here is a bit of interesting comic history.  Wolverine was originally planned to be a real wolverine.  No really. The character's original origin tied into the High Evolutionary, who was a common foe of many Marvel heroes, especially the Avengers, during the 1970s. the High Evolutionary was especially known for his evolutionary experiments on animals, making them bipedal and giving them human or near human intelligence. 

 

Under this version of his origin, the High Evolutionary would have experimented on a wolverine, giving him human intelligence and stature but keeping his aggressive nature. Wolverine would have escaped from Wundargore Mountain, unaware of his true nature and becoming an agent of the Canadian government and later an X-man. This version of his origin was, of course dumped, although some trace of it remained in early issues, especially when he was captured and scanned and the results indicated unusual readings indicating something odd about his mutant status.  After those first issues, the matter was never mentioned agin.