Young Justice villains

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  Acolyte (New Earth)
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  Agenda
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  Agua Sin Gaaz (New Earth)
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  Albert Michaels (Earth-16)
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  Alexander Luthor (Earth-16)
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  Amanda Spence (New Earth)
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  Amazo (Earth-16)
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  Ambassador (Earth-16)
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  Anthony Ivo (Earth-16)
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  Arthur Brown (Prime Earth)

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  Bane (Earth-16)
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  Baran Flinders (Earth-16)
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  Bedlam II (New Earth)
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  Black Beetle (Earth-16)
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  Black Manta (Earth-16)
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  Black Manta (Lego Batman)
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  Brain (Earth-16)
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  Brion Markov (Earth-16)
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  Bromwell Stikk (Earth-16)

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  Cameron Mahkent (Earth-16)
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  Cassandra Sandsmark (Earth 3)
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  Cassandra Savage (Earth-16)
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  Catherine Todd (World Without Young Justice)
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  Citizen Abra (Earth-16)

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  Daniel Brickwell (Earth-16)
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  Dante (New Earth)
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  Dark Opal (Prime Earth)
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  Devastation (Earth-16)
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  Devastation (New Earth)
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  Doctor Glory (Prime Earth)
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  Doomsboy (World Without Young Justice)

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  Edward Nigma (Earth-16)
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  Eric Needham (Earth-16)
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  Erica Alexandra del Portenza (New Earth)

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  George Harkness (Earth-16)
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  Gilotina (Earth-16)
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  Granny Goodness (Earth-16)

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  Helga Jace (Earth-16)
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  Hook (Earth-16)

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  Injustice League (Earth-16)

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  Jade Nguyen (Earth-16)
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  Jeffrey Burr (Earth-16)
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  Joker (Earth-16)

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  Kent Connor (New Earth)
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  Klarion (Earth-16)
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  Klarion Bleak (New Earth)

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  Lashina (Earth-16)
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  Lawrence Crock (Earth-16)
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  Leonard Smalls (Earth-16)
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  Light (Earth-16)

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  Mallah (Earth-16)
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  Matthew Hagen (Earth-16)
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  Matthew Stuart (New Earth)

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  Nina Dowd (New Earth)

• 
  Old Justice
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  Onslaught (Earth-16)
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  Orm Marius (Earth-16)

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  Pamela Isley (Earth-16)
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  Point Men
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  Professor Ojo (Earth-16)

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  Queen Bee (Earth-16)

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  Ra's al Ghul (Earth-16)
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  Raymond Jensen (Earth-16)
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  Rip Roar (New Earth)

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  Scientist (Earth-16)
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  Selinda Flinders (Earth-16)
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  Simon Ecks (Earth-16)
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  Simon Jones (Earth-16)
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  Slade Wilson (Earth-16)
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  Starrla (Earth 11)

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  Task Force X (Earth-16)
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  Teth-Adam (Earth-16)
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  The Reach (Earth-16)
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  Tommy Terror (Earth-16)
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  Tora (New Earth)
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  Tuppence Terror (Earth-16)
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  Turk (New Earth)

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  Ultra-Humanite (Earth-16)

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  Vandal Savage (Earth-16)

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  Werner Vertigo (Earth-16)
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  William Hayes (Earth-16)
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  William Hayes (New Earth)
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  William Hayes (World Without Young Justice)
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  Willis Todd (World Without Young Justice)
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  Wotan (Earth-16)