Sources - Alexis-Arduca/opponentAI GitHub Wiki

Enemy AI Behavior: https://benstewartgames.com/enemy-ai-behavior/ (based on Patrol / Chase / Attack states)
Seed system Unity: https://docs.unity3d.com/530/Documentation/ScriptReference/Random-seed.html
Unity 2D animator: https://docs.unity3d.com/Manual/class-AnimatorController.html