As far as Marvel characters who have not been on screen in film but who should be are as follows:
Hercules- Demigod son of Zeus; of Greek mythology you basically introduce Greek mythos into the MCU and yeah sure there have been so many adaptations of Greek mythology on film but never ever been done in Marvel.
Moon Knight
Namor The Sub Mariner
Captain Britain
Spectrum
Nova
Spider Woman
Wonder Man
Shang-Chi Master of Kung Fu
She-Hulk
Ms. Marvel (Kamala Khan)
Hercules- Demigod son of Zeus; of Greek mythology you basically introduce Greek mythos into the MCU and yeah sure there have been so many adaptations of Greek mythology on film but never ever been done in Marvel.
Moon Knight
Namor The Sub Mariner
Captain Britain
Spectrum
Nova
Spider Woman
Wonder Man
Shang-Chi Master of Kung Fu
She-Hulk
Ms. Marvel (Kamala Khan)