Adding Monobehaviours to Pure ECS Entities/Archetypes?

Unity Engine
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1

Can I add Monobehavoiur Components like Transforms, Animators and Stuff to Entities/Archetypes (since they have to be declared in code)? Or should I go the GameObjectEntity route and use ComponentSystem for Monobehaviour Context and IComponentData/JobComponentSystem for “pure” ECS? (Which I guess is just Hybrid ECS, even If I use JobCOmponentSystem)

Can/Should I still use EntityManager and World/Archetypes then?

2

You can use EntityManager.AddComponentObject to add Hybrid Components to an entity.