Starscream M
For the amalgams, their attributes stack, they have combination of all of their unique powers/attributes and they retain the original's mastery of all power. And the individual weaknesses of either character is eliminated as long as the character they're amalgamating with does not share similar weakness. Their mind is taken by the superior of the two.
Classic versions of all characters unless otherwise stated.
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Super Surfer - Superman / Silver Surfer
vs
Asgardian Manhunter - Thor / Martian Manhunter
vs
Speed Hulk - Hulk / Flash (Wally)
vs
Magnetic Cyborg - Magneto / Cyborg Superman
vs
Black Doom - Black Adam / Dr. Doom
vs
Unstoppable Mustache - Juggernaut / Sinestro
Classic versions of all characters unless otherwise stated.
------------------------------------------------------------------------------------
Super Surfer - Superman / Silver Surfer
vs
Asgardian Manhunter - Thor / Martian Manhunter
vs
Speed Hulk - Hulk / Flash (Wally)
vs
Magnetic Cyborg - Magneto / Cyborg Superman
vs
Black Doom - Black Adam / Dr. Doom
vs
Unstoppable Mustache - Juggernaut / Sinestro