Suggestions by @themegacaster

Doctor Sivana

as DC Bosses in Marvel and DC: Absolute Alliance

Ocean Master

as DC Bosses in Marvel and DC: Absolute Alliance

Circe (DC Comics)

as DC Bosses in Marvel and DC: Absolute Alliance

Cheetah

as DC Bosses in Marvel and DC: Absolute Alliance

The Lizard (Dr. Curt Connors)

as Marvel Bosses in Marvel and DC: Absolute Alliance

Starro

as DC Bosses in Marvel and DC: Absolute Alliance

Mr. Freeze (Dr. Victor Fries)

as DC Bosses in Marvel and DC: Absolute Alliance

Darkseid

as DC Bosses in Marvel and DC: Absolute Alliance

Cheshire

as DC Bosses in Marvel and DC: Absolute Alliance

Galactus

as Marvel Bosses in Marvel and DC: Absolute Alliance

Juggernaut

as Marvel Bosses in Marvel and DC: Absolute Alliance

Killer Moth

as DC Bosses in Marvel and DC: Absolute Alliance

T-Ray (Marvel)

as Marvel Bosses in Marvel and DC: Absolute Alliance

Erik Killmonger

as Marvel Bosses in Marvel and DC: Absolute Alliance

Ulysses Klaue

as Marvel Bosses in Marvel and DC: Absolute Alliance

Mole Man

as Marvel Bosses in Marvel and DC: Absolute Alliance

Attuma

as Marvel Bosses in Marvel and DC: Absolute Alliance

Diablo (Marvel)

as Marvel Bosses in Marvel and DC: Absolute Alliance

Roger Gocking (Porcupine)

as Marvel Bosses in Marvel and DC: Absolute Alliance

Magneto (Max Eisenhardt/Erik Lehnsherr)

as Marvel Bosses in Marvel and DC: Absolute Alliance