Suggestions by @gibsong

Annihilus (Marvel)

as Marvel Supervillains in My Favourite Superheroes

Score: +1

Doctor Octopus (Dr. Otto Octavius)

as Marvel Supervillains in My Favourite Superheroes

Score: +1

Superboy (Conner Kent)

as DC Superheroes in My Favourite Superheroes

Score: +1

Nightwing (Dick Grayson)

as DC Superheroes in My Favourite Superheroes

Score: +1

Captain America

as Marvel Superheroes in My Favourite Superheroes

Score: +2

Iron Fist (Danny Rand)

as Marvel Superheroes in My Favourite Superheroes

Score: +1

Doctor Voodoo

as Marvel Superheroes in My Favourite Superheroes

Score: +1

Daredevil (Elektra Natchios)

as Marvel Superheroes in My Favourite Superheroes

Score: +2

Floronic Man

as Dc Supervillains in My Favourite Superheroes

Score: +1

Mad Hatter (DC)

as Dc Supervillains in My Favourite Superheroes

Score: +1

Mr. Sinister

as Marvel Supervillains in My Favourite Superheroes

Score: +3

Baron Zemo

as Marvel Supervillains in My Favourite Superheroes

Score: +1

Typhoid Mary (Mary Walker)

as Marvel Supervillains in My Favourite Superheroes

Score: +1

Bullseye (Marvel)

as Marvel Supervillains in My Favourite Superheroes

Score: +2

Swamp Thing (Alec Holland)

as DC Superheroes in My Favourite Superheroes

Score: +2

Mister Fantastic (Reed Richards)

as Marvel Superheroes in My Favourite Superheroes

Score: +2

Spider-Girl (Mayday Parker)

as Marvel Superheroes in My Favourite Superheroes

Score: +2

White Tiger (Hector Ayala)

as Marvel Superheroes in My Favourite Superheroes

Score: +1

Ghost Rider (Danny Ketch)

as Marvel Superheroes in My Favourite Superheroes

Score: +2

Wasp (Janet van Dyne)

as Marvel Superheroes in My Favourite Superheroes

Score: +2