Suggestions by @andymayer

Sephiroth

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Clockwerk

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Norman Osborn

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Colonel Stinkmeaner

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Muzan Kibutsuji

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Mahito

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Ryomen Sukuna

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

All for One (My Hero Academia)

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Bullseye (Benjamin Poindexter)

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Powerplex

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

FAKE

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Sabretooth (Victor Creed)

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Baron Zemo

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Doctor Victor von Doom

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Frieza

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Dio Brando

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Black Manta

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Angstrom Levy

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Lex Luthor

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores

Professor Zoom / Reverse-Flash (Eobard Thawne)

as Biggest Haters in Fiction in Oddly Specific Mount Rushmores