This is my idea to make an Enemy
Make two blocksters. One will be your character. Edit how you want them to look.
Does - Mover Bump (Circle Tag) - Does - Explode [or freeze, hide] [Optional] Up - Does - Jump Does - Square Tag
Does - Circle Tag [Sight Line (Circle Tag) optional] - Does - Chase (Circle Tag) [or go to]
See Concept:Enemy for ideas on how to make your own enemies