Avengers + Justice League = Justice Avengers

Captain America + Flash = Captain Mach

Namor + Wonder Woman = Imperia

Hulk + Superman = Gamma Man

Iron Man + Batman = Iron Night

Black Panther + Vixen = Sphinx

Spider-Man + Shazam = Arachnid

Black Widow + Catwoman = Tarantula

War Machine + Black Lightning = Warbolt

Hawkeye + Nightwing = Nightwatch

Mockingbird + Batgirl = Nightengale

Thor + Hawkman = Thunderhawk

Valkyrie + Hawkgirl = Brighthawk

Ant Man + Captain Atom = Atomic Ant

Wasp + Fire = Firefly

Photon + Green Lantern = Green Sceptre

She-Hulk + Supergirl = Gamma Girl

Jack of Hearts + Martian Manhunter = Jack of Mars

Hercules + Aquaman = Neptune

Moon Knight + Blue Beetle = Silver Scarab

Guardians of the Galaxy + Teen Titans = Titans of the Galaxy

Star-Lord + Beast Boy = Beast-Lord

Nebula + Starfire = Stardust

Rocket Raccoon + Arsenal = Red Rocket

Groot + Cyborg = Cygroot

Moondragon + Raven = Dragonfly

Captain Marvel + Dr. Light = Captain Light/Doctor Binary

Gamora + Maxima = Maximora

Silver Surfer + Harbinger = Satellite

Starhawk + Firestorm = Starstorm

Galactus + Monitor = Galanitor, Collector of Planets

Thanos + Mongul = Monos

MI:13 + Justice League Elite = Justice Knights

Captain Britain + Sister Superior = Brother Britain

Psylocke + Manchester Black = Gloriana Black

Jamie Braddock + Klarion = Jamion Black

Pete Wisdom + Coldcast = Redforge

Meggan + Menagerie = Nahual

Black Knight + Guardian = Gold Knight

X-Men (future) + Legionnaires = Exemplars

Domino + Triad = Dice

Polaris + Gossamer = Molecula

Quicksilver + Lightning Lad = Silver Spark

Sunfire + Dragonmage = Dragonfire

Cypher + Brainiac 5 = Vertex

Dani Moonstar + Dawnstar = Dani Dawnstar

Fantastic Four + Metal Men = Ferrous Four

Mr. Fantastic + Gold = Bigshot

Invisible Woman + Platinum = Chîc

Human Torch + Mercury = Fahrenheit

Thing + Iron = Sledge

Hellfire Club + Fatal Five = Hellfire Five

Selene + Emerald Empress = Ebon Empress

Emma Frost + Silver Swan = White Swan

Donald Pierce + Tharok = Dark King

No-Girl + Zymyr = Zyrtha

Fitzroy + Mano = Chronomano

Dark Illuminati + Legion of Doom = The Doominati

Ultron + Brainiac = Ultimatum

Loki + The Joker = Trickster

Doctor Doom + Two-Face = Doom Face

Mephisto + Trigon = Trifecto

Baron Zemo + Riddler = Baron Enigma

Red Skull + Doctor Cyber= Cyber Skull

Magneto + Lightning Lord = Vector

Goblyn Queen + Poison Ivy = Succuba

Mr. Sinister + Sinestro = Mr. Sinistro

Independent Villains:

The Mandarin + Ra's Al Guhl = Ra's Khan

Baron Blood + Silver Banshee = Bloodscream

Abomination + Bizarro = Deviant

Mojo + Toyman = Monopoly

Venom + Black Adam = Recluse

I'm seeing now how mucho-mucho complicated blending such detailed backgrounds from 2 universes seamlessly together can be. Back when Amalgam was out, I didn't like how in some instances characters were pieced together from 3 rather than 2 individuals, or how bits of 1 character were carried over into 2 amalgams...but it turns out this was necessary to make sense of this mish-mash reality.