Villains are characters based off of the villains from My Hero Academia (pretty self-explanatory). Below are some key features of the villains:
- Mastery quests often involve defeating specifically villains to complete them.
- Certain world events such as the Halloween event Trick-Or-Treat doors have given specific unique animations to villains, and villain's Trick-Or-Treat animation were the fastest back then.
- Villains make up 50% of the roster on average (this changes every new character, but Villains and Heroes stay equal to each other one after another generally.)
The list of Heroes Battlegrounds' current villains includes:
- Hero Slayer, based on Chizome Akaguro, or "Hero Killer: Stain", formerly "Stendhal".
- Mastered Hero Slayer, based off Chizome Akaguro, or "Hero Killer: Stain", formerly "Stendhal".
- Azure Flames, based off Dabi, formerly Toya Todoroki.
- Mastered Azure Flames, based off of Dabi, formerly Toya Todoroki.
- Symbol of Fear, based off Tomura Shigaraki, formerly Tenko Shimura, and the person behind your avatar in spawn animation and some animations from Everything For One ultimate is based off All For One, otherwise "Demon Lord".
- Warp Portal, based off Kurogiri, a sentient High-End Nomu and Shigaraki's watchful eye.